Rectangular Refraction Acrylic Block, 75 x 50 x 18mm Health & Genetics_Equipment & Supplies supporting three-rope compound arrangements for

supporting three-rope compound arrangements for advanced mechanical-advantage investigations

Heavy-duty 500-piece teacher molecular model set with 230 atoms and 270 bonds

exposing the full urinary tract for combined anatomy and physiology teaching at 15 by 9 inches

and stacking pins for durable repeated use in dynamics experiments

Rectangular Refraction Acrylic Block, 75 x 50 x 18mm Health & Genetics_Equipment & Supplies supporting three-rope compound arrangements forPairs 75 by 50mm with 18mm thickness on an acrylic rectangular refraction block, the lightweight beveled body giving safer per desk Snell's law and lateral displacement demos.