Description: 【1:14 Scale Fit】: Ideal for RC tractor and truck enthusiasts, this quality metal gearbox set is engineered specifically for 1:14 scale remote controlled vehicles. No more incompatible parts or poor performance from ill fitting gear components 【Heavy Duty Metal Construction】: Crafted from sturdy copper gears that withstand high torque demands and prolonged use. Ideal for demanding applications, no more stripped PP gears failing during critical towing or hauling operations 【Smooth Power Transmission】: Provides great performance with precisely machined gears for seamless power transfer. No more jerky acceleration or gear grinding that compromises your RC vehicle's operation 【Easy Installation】: Designed as direct replacement with simple bolt on installation requiring minimal tools. Ideal for hobbyists, no more complicated modifications or professional help needed for gearbox repairs 【Reliable Spare Part】: Serves as a dependable replacement component that restores equipment performance. No more downtime for your favorite RC vehicles waiting for repair parts Specification: Material: Copper Size Chart: 44T: 3.67cmx1.05cm/1.44inchx0.41inch 37T: 3.12cmx1cm/1.23inchx0.39inch 36T: 3.67cmx1.44cm/1.44inchx0.57inch 30T: 2.56cmx1cm/1.01inchx0.39inch 27T: 2.3cmx0.8cm/0.91inchx0.31inch 20T: 1.75cmx0.8cm/0.69inchx0.31inch 10T: 0.93cmx0.9cm/0.37inchx0.35inch Package Includes: 7 Gearbox Gears(1pcs 44T, 1pcs 37T, 1pcs 36T, 1pcs 30T, 1pcs 27T, 1pcs 20T, 1pcs 10T) Note: Please allow slightly errors due to manual measurement and different monitors.