CARTMAN 4 Gauge 20 Feet Jumper Cables Automotive Booster Cables with Carry Bag for Car SUV and Pickup Trucks

Haven’t needed to use them yet, but they seem like really good quality. Came in a nice compact travel bag. Heavy duty weight to them. I think these will be perfect if ever needed.

These are clearly much better than the typical ones found in an auto parts store. I purchased these to keep in my RAM. The more common, smaller gauge cables at best struggle to boost the heavier batteries found in these types of vehicles, so heavier gauge cables are a must. I see some ridiculous reviews complaining about the cables being copper clad aluminum as opposed to solid copper cables. That's simply an example of having a little, but not enough knowledge. The Service Entrance cables from the utility pole to your home are strictly aluminum - not copper and not even copper-clad aluminum. For the person looking to boost most types of vehicle batteries encountered, there's just simply no need for anything more than these.These are "heavy duty" in the sense that they are a larger gauge than most of the more commonly available smaller 6 or 8 gauge cables found in retail stores. (Reminder...the smaller the number, the larger the gauge and thicker the wire....4 gauge is thicker than 8 gauge).These are built well and the handles are insulated well. The clamps are versatile and can be clamped straight-on or from the side, accommodating most battery post styles. The additional length is a huge plus, especially with a larger vehicle such as mine. You don't have to worry about positioning the vehicles just right to use them like most sets of cables, which is sometimes difficult when a battery dies. They came with a pair of gloves and a small wire brush for cleaning terminals. Not essential, but a nice touch.The carrying bag is sufficient for a typical few-times-per year use, and the cables should provide years of use if stored responsibly and not used to tie-down cargo or if hastily rolled-up, tangled and thrown in a trunk like most lazy people do. If you are performing recovery service you would need a more durable carrying case.Another thing....they are not intended to be pulled-apart, as the jacket is not perforated and will likely tear and expose the conductors. I see other reviewers peeled them apart and then complained the conductors become exposed. It's like peeling apart the cord on your laptop or table lamp - why would you do that? Just because you see a line between the two, doesn't mean you can pull them apart. If you want cables that are completely separate you can find and purchase them that way. Not sure why someone would alter a product then ding it for failing.I wouldn't pay much attention to some of the over dramatic negative reviews or the one's complaining about copper-clad vs pure copper conductors. Those differences are applicable for precise electronics where every watt and milliamp count and extreme efficiency is needed. Boosting a battery requires sufficient voltage and current for a relatively short time and nothing more. And besides, do you know what these would cost if they were pure copper? I spent 10 years in the electrical trades and now do design work which entails calculating current, voltage drop and ampacity. In my opinion and experience, these are a good purchase overall for what they're designed for.NOTE: I purchased this item on Amazon for full price and have no affiliation to the seller. I try to write helpful, unbiased and insightful reviews because I also read reviews prior to making my own buying decisions. I notice many reviews lack helpful information, are not well written or give poor reviews based on not reading directions, inexperience or failing to read the product details prior to purchasing. Writing valuable reviews helps pay it forward.

Read the reviews, and these are at the top of the list on a couple of review sites. Nice and long, very supple/flexible, with sturdy clamps. Thought the length might impact charging capability but they work like a charm.

Worked well, clamps seem to be attached firmly. Wire seems to be of lighter gauge than advertised, but performed ok. The storage case is pretty sturdy, and should last.

I purchased them for a new car. One of those things you hope you never have to use. But the quality is excellent and I appreciate the extras that are not included with most - a small wire brush and a sturdy generously sized storage bag.

Short version: These are the cables to buy! If you're in the market for jumper cables, stop looking, buy these.Long version:Our story: We went through two sets of other jumper cables before finding these. Both were different brands purchased from different brick-and-mortar auto-parts stores. The first pair had nice 20-foot, 4-gauge cables but this silly ratchet mechanism on the clamps that didn't firmly grip the battery terminals. It took forever to get them in a position where they would stay on the terminals and even then, the connection was poor, resulting in arcing and a slow charge. The second pair had better clamps but was only 12 feet (still 4-gauge cable). In our case, our vehicles are in a two-car garage. The car on the right had a battery sitting on the left side of the hood; the car on the left had a battery sitting on the right side of the hood. 12 feet is not enough to reach between batteries in this case. Bring on round three, the Cartman cables:Pros: Powerful, rugged clamps grip terminals firmly. 20-foot cable is long enough for most jumper applications but not so long as to be unwieldy. 4-gauge wire is a must; you don't want lighter, trust me. On top of that, the cables came in a nice bag and included gloves and a terminal cleaning brush as a bonus.Cons: None whatsoever.A quick lesson on car batteries: The biggest load your battery has to drive is the engine starter. This means that even if your lights and windows work, you still may not be able to start your engine due to a depleted battery being incapable of sourcing the required current. It also means that you need some big heavy cables to jump an engine from someone else's battery. If you try to use small cables, the resistance in the smaller cable will cause a voltage drop which will make it difficult and unsafe to jump start an engine. Imagine the battery is a swimming pool. Would you want to fill a swimming pool from a fire hose or a garden hose? Anyway, once the engine is running, the alternator/rectifier charges the battery. Often if you can jump the engine and run the vehicle for a while, the battery will be fine because the alternator/rectifier will charge it back up. Other times, you'll jump it, it'll run fine for a while, then the next day it'll be dead again. This could be an alternator not charging your battery the way it's supposed to or it could be an aging battery that has trouble holding a charge. Batteries live 3-5 years depending on quality, how often you run your car, and the environment in which their kept (garage or outdoors in the cold).

Arrived promptly, which was good because I used it twice in the next 48 hours. Easy to use, clamps worked well, 20 foot length came in very handy. Price was very reasonable. Would definitely recommend this product.

Best jumper cables I’ve ever owned. Built very well and extremely heavy duty. These are even long enough to jump a truck directly behind yours.