Pulley Large Demonstration Double, 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
Conductivity of Solution Demonstration, Visual demonstration of the conductive properties of a variety of liquids, Apparatus includes 1 Glass tumbler, 1 light bulb 1 lid with socket, binding posts and electrodes