Pulley Large Demonstration Single, 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
Well Slides, Large, Reusable, 3x1in, constructed of clear plastic, raised edges, well is approximately 16mm diameter with a depth of 2-3mm, dimensions: 6in x 5in x1in