Specification:Name: Spur Gear Flat Gear Cylindrical GearMaterial: Beige Nylon (Plastic)Model: 2M (2 Module)Teeth: 25 26 27 28 29 30 32 34 35 36 38 forty forty two forty five 48 50TeethTooth Pitch: 6.28mmTotal Thickness: 20mmProcess Hole: 6mm 8mm 10mmTooth Surface Hardness: Soft teeth surfaceFeatures:Light weight, high strength, self-lubrication, good flexibility and coffee noise.Note:Individual gears may possibly exist a little burr, and doesn't impact the actual use, please take care once you mind.Package:Packing : Plastic bag / Carton box.Quantity : According on your Choose!