Style:New Classical/Post-modern Description: 1. Use: physics teaching instrument 2. Material: bracket and base: ABS advanced plastic, sphere: iron 3. Size: 13.5 × 11.5 × 13.5 cm 4. Net weight: 192g 5. Five balls are hanging side by side, they are in contact with each other and their centers are on the same line. 6. How to use: first pull the ball on the left 15 ~ 20 mm, then release it, and the ball on the right next to it stops after colliding, while the ball on the right swings up, and the swing distance is the same as that on the left. The distance of the ball is roughly the same
