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

Very nice but beware of tangling nylon cords if used with too young of child. I recommend this for 8 yr old and up.

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

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

The product came with one of the strings broken, thankfully I was able to superglue it back

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

Bought for family Christmas present and lived by all! Great value!

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

Works perfectly

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。