Newton's Cradle Balance Pendulum, Physics Learning Desk Toy, Swinging Kinetic Balls for Home, Office Decoration, Stress Relief, Fun Science Fidget Accessories (7x6x7 in)

The balls will occasionally tangle if you make them go too fast or lift the end one too high but I’ve untangled them multiple times from kids playing with it and it still works as expected. The frame is very light and plasticy but the balls do what they’re supposed to do.

Very satisfied with this version of the classic newton’s cradle. Well worth the price.

Terrible! Bought this for my son’s birthday and when we assembled it, it didn’t work and broke within minutes. I bought it early so the return window closed. Waste of money, do not buy it!

I had this in my classroom and it was perfect until it accidentally got tangled. It quickly became a jumbled up mess and had to be thrown away. 😐

I gave this to my boss and he loved it.Definitely a great birthday gift for someone in the office.

The little marbles do not line up perfectly straight, so the effect of their moving together doesn't always work. Next time I would get a slightly more expensive unit.

The media could not be loaded. My son has been wanting one of these for so long. He has been gifted ones that have had thin plastic strings that broke almost immediately but this one was packed well, strung well, feels of good quality and it's lasted multiple days of constant use by my 10 year. This is a great buy for my family.

It would have been great if it wasn’t broken upon arrival. When I tried to get another one the system wouldn’t allow it so I had to do a full return. Disappointed that it was broken.