GPMFor Traxxas X Maxx 4X4 Upgrade Parts 2.6mm Coil Springs For Original Or GPM Optional Shocks TXM12170-1 Set Green

Parts were good quality shipping took awhile but work great

I tried to use these springs and they have a hiogher stiffness than the stock X-Maxx ones but not as HD as the 1.5338 Rate Springs. that said, if you wanna try out your own Dual-Rate system, then the grommets that come in this pack are definitely worth the cost of the whole thing... Especially when comparing to the cost of the Proline grommet. In fact, I ended up buying the Proline ones, then just using the top springs from one set of those and using the grommets from this set for the spacers. Works really well and glides smooth over time.