- 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: 1.5，2， 2.5，3- 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 2410-2BDimensions: 1.10 in x 1.10 in x 0.16 in (2.8 cm x 2.8 cm x 0.4 cm)Weight: 1.27 oz (36 g)<img src="http://112.74.112.28/down/products/414060/414060_000.jpg">