Pulley Large Demonstration Triple, Designed for Classroom Demonstrations, Light-weight, low-friction, and deformation-resistant plastic ensures accurate results, Open to make it easier for users to run pulley cords through them
Equal Mass Cylinder Set, Aluminum, Copper, Tin, Zinc, Lead, 5 Cylinders, 0.5 Inches In Diameter, To Study The Relationship Between Mass & Density, Set Of 5 Cylinders Having Same Mass & Dia 0.50in Varying Lengths.