Model: C-57 - Color: White - Quantity: 58PCS - Material: Plastic - Modulus: 0.5 - Aperture: 1.5 2 2.5 3 - Calculate the gear diameter: - A means tight match than the standard small aperture 0.05mm B means untight match with a large diameter than the standard 0.05 - (Number of teeth +2) * modulus = gear diameter; This package gear modulus: 0.5 Aperture: 1.52 2.53 - Spindle Gear: 8-1.5A 18-2.5A18-3A 82A 10-2A 14-2A 16-2A 9-2A 12-2A - Crown gear: C202.5A C24102Ac24102b C30102B C20-3A C28-2AC30-3A C3610-2B C2810-2A C20-2A - Single Gear: 202A 262A282A402A522.5A 563A24-2.5A 36-2A 38-2A 38-3A 44-2A 44-2.5A 48-2A 46-2.5A 50-3A56-2A 422A 30-2A - Double gear: 18102A 48122.5A 4610-2B 4810-2B 2610-2B 2210-2B 3212-2B 2810-2B 3808-2B 2810-2B 3210-2B2808-2B 3412-2B 3610-2B 5010-2B 4410-2B 5610-2A 3010-2B 2410-2B