Ofna transmission has a aluminum gear holder. First gear spur holder has one-way bearing installed. Second gear holder has hole for adjusting the shift point. Spur gears have the teeth count on each spur. Gear changes are made easy by the design of the gear holders. This kit includes two spur gears 45 and 49 teeth, first and second gear holder, two clutch shoes, center gear shaft, two 3X15mm screws, two 8X12mm flanged bearings, two 4mm balls, two 6X6mm set screws, two 3mm nylon nuts, one clutch bell with 18 and 14 teeth gears, two allen wrenches (2 & 2.5mm), second gear clutch shoes and instruction sheet.