5-Piece Low-Friction Double-Tandem Plastic Pulley Set, 38 and 50mm

This set of 5 double plastic pulleys features tandem wheels with diameters of 38 and 50 mm, mounted on open-sided steel frames with hooks at each end. The pulleys use a low-friction ball bearing design, and the open-sided frames eliminate the need for threading the cord. Designed for physics education, this set enables demonstrations and experiments involving compound pulley systems, mechanical advantage, and force multiplication. The dual-diameter tandem configuration provides versatility in classroom setups.