The American Educational 7-200-4-3/4-A steel ball has a hole and is used for collision and pendulum activities that demonstrate force, motion, and mass in the classroom. It is 3/4" in diameter and comes in a package of five.
American Educational Products manufactures learning materials in math, science, and reading/language arts for students in pre-kindergarten through grade 12. The company, founded in 1986, is headquartered in Fort Collins, CO.