Green Stuff World Plastic Cogs & Gears Science - 12 years and up

This is a mixed bag of spindle gears, crown gear, single reduction gear, double reduction gear, pulley, worm, etc. all made of PLASTIC. All consistent with each other so they can match each other. Perfect for steampunk projects, arts and crafts, jewelry making, miniature basing, etc... Contains almost all commonly used plastic Cogs & Gears Total Diameter of the Gears from 5mm to 30mm Diameter of the middle holes: 1.5mm/2mm/2.5mm/3mm Content Variety: Spindle gear (9 types) Crown tooth (10 types) Single Gear (18 types) Double gear(18 types) Worm Gear (2 types) Pulley Gear (1 type)