75 x 50 x 18mmm. Excellent tools for a variety of optical experiments, including Snell’s Law of Refraction. Glass plates cemented together. Hollow on the inside that allows liquid to be poured inside. Stopper included.

Also available:
Hollow Glass Prism with Stopper (PH0552B) - 50 x 50mm
Hollow Glass Cube Stopper (PH0552D) - 50 x 50 x 50mm
Hollow Glass - Set of 3 with Stoppers (PH0552SET)