Concave Glass Mirror, 50mm Diameter, 150mm Focal Length Pack Size_Single Tandem double plastic pulley pairing

Tandem double plastic pulley pairing 38mm and 50mm low-friction wheels on an open-sided steel frame

Triple tandem plastic pulley with 25/38/50mm ball-bearing wheels on an open-sided 17

Selected through four rotary-switch decades from 0 to 11

providing dense uniform spheres for ramp-and-collision experiments where a heavier projectile is needed than the plastic marbles can provide

supplying a hands-on teaching tool for atomic and molecular orbital visualization in introductory and advanced chemistry

Concave Glass Mirror, 50mm Diameter, 150mm Focal Length Pack Size_Single Tandem double plastic pulley pairingConcave glass mirror, 50mm diameter and 150mm focal length, the f 3 curvature stretching the focal throw for demos that need the focal point set comfortably beyond the mirror face.