Special hybrid polymer gears 64 pitch, 38, 39 teeth, for 3/32" axle, feature a new type of solid hub, gear is made with perfect precision, teeth are made from high durability polymer, finally the axle bore is fairly finished to 2,372mm (.09338"), perfect for Slick7 and Koford axles, tested to face a whole G7 race, pretty fast, made from material that withstands everything, selected ones, high quality and accuracy, for demanding racers, tested on roll tester.