Description: 100% brand new and high quality Material:Plastic Color: White A-Means tight set (will be small 0.05mm than the default) B-Means loose play (will be 0.05mm higher than the Standard) Gear Diameter: (Teeth + 2) * Module = Gear Diameter Module: 3.5 Shaft Gear (9 styles): 83.5A 9-2A 8-2A-10 10-2A 14-2A 12-2A 16-2A 18-2.5A 18-3A Crown of tooth (10 styles): C20-2.5A C20-C20 2a-3a C2410-C2410 C2410-2B C2810-2B C28-C30-2A C3010-2B C30-3A C3610-2B Gear Single (18 styles): 20-2A 26-2A 24-2.5A 28-2A 30-2A 36-2A 38-2A 38-3A 40-2A 42-2A 44-2A 44-2.5A 46-2.5A 46 -48-2A-3A 52-2.5A 56-2A 56-3A Double gear (18 styles): 1810-2A 4812-2.5A 2210-2B 2410-2B 2610-2B 2808-2B 4610-2B 2810-2B 3010-2B 3210-2B 3212-2B 3412-2B 3610-2B 3808-2B 4410-2B 4810-2B 5010-2B 5610-2A Worm Gear (2 styles): 6 * 6-2A 6 * 8-2A Gear pulley (1 styles): 6 * 6-2A Size: Aperture 1.5/2/2.5/3 No retail package Quantity:58Pcs Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes: 58Pcs x Plastic Gears All The Module