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Gear module: Module 0.5
Gear thickness: 4-5mm 
Gear Material:  Plastic
Gear Color: White
Gear Structural Features:  Double-layer Gear

Option Model Code Description:
1. The first two digits of the code: the number of teeth of the external gears.
2. The third and fourth digits of the code: the number of teeth of the internal gear teeth.
3. The fifth digit of the code: represents the bore size of the gear.
4. English code: "A": tight fit; "B": loose fit.
For example:
The "2A" means that the bore is 1.95mm; with 2mm bare shaft, tight fit, and shaft together with the rotation.
The "2B" means that the bore is 2.05mm; it is loosely fitted with a 2mm bare shaft and rotates freely on the shaft.
Gear diameter calculation formula: (number of teeth + 2) X 0.5 (mm)

Example: Dimensions of Gear Model "16102B" : 
16 teeth of the external gears
10 teeth of the internal gears
2.05mm bore, loosely fitted 2mm shaft
Gear diameter: (16+2) X 0.5 (mm) = 9mm, Gear outer diameter is 9mm.