Package Include 2 x Right Helical Spur Gear; For Gear Matching one gear must have Left Helical Teeth and other Right helical Teeth.Outer Diameter: 69mm; No. of teeth: 18; Thickness (Teeth Portion): 15mm; Teeth Type: Helical Right Hand; Helix Angle: 45 Degree Compatible shaft size: 6mm; Module: 2.5; Hub Diameter: 25mm; Hub Length: 10mm; Check picture for exact dimensions Color of Gear may be changed from picture. If you have any specific color requirement please contact us before ordering. Note: Gear is 3D Printed with 100% infill. Gear is solid from inside and can take considerable load. As gear is 3D Printed there is some marks over its surface.