An oversized set of 6 lenses and prisms designed for mounting on a magnetic chalk or marker board. Lenses are about 8" long, so your optics experiments would be clearly visible from every part of the classroom. Each piece in the set has a pre-attached magnetic backing. Set contains 1 each of semi-circular lens, equilateral prism (3" sides), double convex lens, double concave lens, single convex lens, and single concave lens. An activity guide is also included. Set comes in a sturdy wooden storage case.