Gears 4/pk
Excellent for Hands-on math, science & technology projects. Gears Black 4/pk 4 gears 12mm, 15mm, 30mm, 40mm diameters. The small 12mm gear will fit the project motors and is used as the pinion gear. Student tested tough and easy to use. These gears allow students to experiment and invent machines which are either motor powered or hand powered.
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