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
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