A - Means tight Match(will small 0.05mm than standard)
B - Means loose Match(will larger 0.05mm than Standard)
Gear Diameter : (Teeth +2) x modulus = Diameter of Gear
Modulus: 0.5
Aperture 1.5/2/2.5/3

Spindle gear(9 styles): 8-1.5A 9-2A 8-2A 10-2A 12-2A 14-2A 16-2A 18-2.5A 18-3A
Crown tooth(10 styles): C20-2.5A C20-2A C20-3A C2410-2A C2410-2B C2810-2B C28-2A C3010-2B C30-3A C3610-2B
Single Gear(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 48-2A 50-3A 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 x 6-2A 6 x 8-2A
Pulley Gear(1 styles): 6 x 6-2A
Package Including:
2 x 58 styles Plastic Gears All The Module 0.5