Kyosho Optima Vintage Series Off-Road Buggy Vehicle (1/10 Scale) Chassis : all plates and the Main chassis bars are now slightly thicker 6061t6 aluminum for improved durability Drive-train : kit includes both chain and belt drive trains allowing use of more powerful motors Gears : 48 pitch gears. Sintered Alloy gears & high impact nylon gears with newly added slipper clutch to handle current power levels Shocks : new 10mm diameter aluminum cylinder with stainless steel shaft for improved damping Hardware : all hex