"The Mystery of Lyle and Louise"

1 pound of black sand packaged in a heat-sealed bag.

Bulk hole plates to expand your TeacherGeek collection

For Versatile Optical Applications

Ceramic Ring Magnets have a high resistance to demagnetization and don't need a keeper.

Individual spherical glass lenses.

Makes demonstrations viewable by the entire classroom.

Ideal selection for use with a ray box.

Superior Grade Rubber Offers Softness, Resiliency, and Durability.

Individual spherical glass lenses.

These ceramic ring magnets have an inside diameter of 35 mm and an outside diameter of 45 mm.