The Dynamite Pinion Gear Set includes 48 pieces of various sized gears (17T, 18T, 19T, 20T, and 21T) designed for RC model vehicles. Made of durable metal, this set is compatible with a 1:8 scale and is suitable for both men and unisex adults. The modern style and animal theme make it an exciting addition to any tabletop play activity, with a manufacturer minimum age of 14. The package dimensions are 4.8x4.0x0.3 inches, and each gear weighs 0.02 pounds, providing a high-quality and affordable solution for enhancing your RC vehicle's performance.