Constant Pinions 2.Number Of Teeth: 6/7/8/9/11/12/13/14/15/16 Teeth 3.Hole Diameter:3/3.9/4.9mm Package Include: Motor Gear x 5pc Number Of Teeth : 6/7/8/9/11/12/13/14/15/16 Teeth Package Include : Gear x 5pc