i thought the entire purpose was to stay in motion until stopped . do they stop on their own?

yes, they will do stop on their own after 50-60 seconds

Does this thing get rusted?

No. We have had ours for a few years now and it is still in like new condition. No rust

What is the length? The title states 11" while the product descriptions specifies 9".

The length of the marble base is 9.06 inches, the width is 6.69 inches, and the diagonal length of the marble base is about 11 inches.

we had one before from a mall and the balls were tangled so we couldn't use it does this one have the balls where they don't tangle ?

The one I ordered through Amazon was packaged very carefully with each ball and string wrapped in plastic. The strings were not tangled. The unit has not tangled; the balls are heavy weight and seem to be good quality. I am sorry that you had that experience. I enjoy the cradle so much; it is intriguing.

Newtons Cradle Pendulum With 7 Balls

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KSh26546

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Sold byAmazon KenyaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🕰️ Elevate your desk game with timeless kinetic elegance!

SLEEK MARBLE BASE - Premium marble foundation adds a touch of sophistication to your desk décor.
SCIENCE MEETS STYLE - A perfect blend of educational physics and executive elegance that sparks curiosity and conversation.
NANO TECH DURABILITY - Ultra-thin, high-impact nylon lines crafted with cutting-edge nano technology for lasting performance.
BONUS SPARE BALL INCLUDED - Never miss a beat with an extra ball and easy wire replacement manual for uninterrupted flow.
MESMERIZING 70 SECOND SWING - Experience the longest, smoothest oscillation that captivates and calms your workspace.

The CERROPI Newton Cradle features 7 perfectly aligned balls delivering an impressive 70+ second swing time, supported by ultra-durable nano-technology nylon lines and anchored on a premium marble base. Designed for adults and kids 5+, it combines scientific intrigue with executive style, making it a must-have desk accessory that guarantees both relaxation and intellectual stimulation.

Specifications

Age Range Description	Adult/Kid
Asin	B082CNJXXF
Best Sellers Rank	#22,290 in Toys & Games (See Top 100 in Toys & Games) #167 in Educational Science Kits
Brand Name	CERROPI
Color	Black
Customer Reviews	4.5 4.5 out of 5 stars (581) 4.5 out of 5 stars
Educational Objective	Logical Thinking
Included Components	1PC Newtons Cradle
Indoor Outdoor Usage	Indoor
Item Dimensions	9.06 x 6.69 x 6.69 inches
Item Type Name	science-kits
Item Weight	2200 g
Manufacturer	CERROPI
Manufacturer Part Number	2056
Manufacturer Recommended Age	5 years and up
Manufacturer Warranty Description	60 Day Warranty Against Manufacturer Defects
Material Type	Marble
Model Number	2056
Number Of Packs	1
Number Of Players	1
Operation Mode	Manual
Size	Medium
Theme	Home Decor
Unit Count	77.6 Ounce
Upc	715668938236 746653837340 745245575738

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