A wooden 1 liter block with 1cm rules on the sides.
A large blank globe that can be drawn upon with chalk.
A smaller blank globe that can be drawn upon with chalk.
This model shows the curl of a vector and how the direction of a magnetic force can easily be determined.
A set of three transparent models that can be used to prove the Pythagorean Theorem algebraically and by inspection.
Five identical triangles can be arranged to show squares on each of the triangles sides, but one at a time.
An orange and white 4-sided stick that is graduated in meters, decimeters, centimeters, & millimeters. Useful for showing the relationship between SI prefixes, or as a more colorful/aesthetic version of a regular meter stick.