|Item Name:||Newton ball|
|Color:||As the picture|
100% good quality and beautiful decoration on the desk.
Best gift for the students and office clerk.
The teaching supply on the physics class of law of conservation of momentum.
Use one steel ball to collide the other steel balls,the last one will be bounced.
Use two steel balls to collide the other steel balls,the last two balls will be bounced.
And the other patterns.