Demonstration Pulley Experiment SetThis physics lab equipment contains 2 single pulleys, 2 set double pulleys for mechanics experiments. MaterialThe pulley block set is made of pp and metal materials that ensures its longevity and maintains its functionality over time. SizesSingle pulley mesures 4cmx10cm, double pulleys diameters are 4cm, 3cm, and 13cm in length. Educational Tool Essential physics experimental equipment for students and teachers, great for teaching mechanics effects in physics. Can be used to demonstrate the principle of pulleys and how they work in real machines. Wide ApplicationGreat for home, school or lab use. Also ideal Birthday and Christmas gift for kids, children in elementary and middle school, can enjoy DIY experiments fun while learning basic physical science knowledge. Specification: Material: PP, Metal Size Chart: Single Pulleys: 4cmx10cm/1.57inchx3.94inchDouble pulleys Diameters: 4cm/1.57inch, 3cm/1.18inch, Length: 13cm/5.12inch Package Includes: 1 Pulley Block Physics Experiments Kits