QLKUNLA Newtons Cradle Balance Balls Science Physics Gadget Desktop Decoration Kinetic Motion Toy for Home and Office(7 Beads) (7 Beads)

Always loved these. This one lasted about 3 weeks but not because the product is flawed, because our son was very rough with it and got it twisted up. The product itself is just fine.

This Newton's Cradle was a great teaching tool—my students grasped the concept more easily. Monitor use as the strings can tangle. It arrived promptly and was perfectly packaged.

Great teaching tool for “conservation of energy”. Also, a fun tool. NO BATTERIES NEEDED!!

This cradle is small-ish but arrived packaged well and works as expected. Perfect for desk or table. The wood base gives it a nice look. I am happy with it for the price.

Great Valentine's day present for my fiance

Worked okay for a few minutes but broke way too easily. Barely even did anything and one of the balls just snapped out. The string they are on is not very secure. It looks nice but didn't last long

It's smaller then I thought it would be but still looks and works great.

My son requested one of these for Christmas. Well made and he loves playing with it.

Fine as a pre-teen toy

Marche très bien

The item delivered was much smaller than indicated, the base was only 9cm x 8,5cm and the height was only 9cm. The principle of conservation of momentum was demonstrable and so will be adequate for its purpose. However I was disappointed with the size. This needs to be amended in the product description.

良い。届くのに少し時間はかかるがものはいい。

Quality was great for the price, solid foundation so it continues to function well now. Size is great for popping on a desk .