The Kyosho Mini-Z AWD Alloy Motor Spacer and Gear Set by GPM is designed for precision fit and stronger drivetrain alignment. The kit contains motor gears 17T, 19T and 21T with matching main gears 31T, 29T and 27T to allow measured changes to gear ratio and vehicle response. Durable alloy spacers reduce movement and help maintain consistent gear mesh during demanding use.