5 steel balls hanging from two strings. Move the first ball and throw it against the others: the first one will stop and the last one will start moving with the same force as the first. If you throw 2 balls, 2 balls will start moving at the opposite end. This behaviour is due to the physical laws of quantity of motion and energy conservation

Packaging dimensions: width 18 cm - height 19 cm - depth 13 cm
Weight: 0.85 Kg.
Ref: 98520