United Scientific Acrylic Prisms in Wooden Storage Box (Set of 6)
High quality acrylic prisms made from clear acrylic sheet with all sides polished. Set consists of 6 prisms in a variety of shapes:  1 rectangular block (75 x 50 x 15 mm)  1 semi-circle (90 mm base x 15 mm thick)  1 equilateral prism (75 mm sides, 15 mm thick)  1 double convex lens (90 mm long, 23 mm at center)  2 double concave lenses (90 mm long, 10 mm at center)Activity guide and 10" x 8" x 2" wooden storage box included. Part No.: 573159.