
The Pulley Demonstration Set by United Scientific is a complete kit for building single, double and compound pulley systems on the bench. A 20 cm x 15 cm wooden base with capstan holds a 61 cm aluminum support rod and a 20 cm crossbar with clamp, and the set includes ten pulleys, cord, clamps and hooked weights from 10 g to 1 kg. Physics teachers use it to demonstrate mechanical advantage and work in simple machines units.