Item Type: 54T Steel Main Spur Gear Material: Steel Color: Black Number of Teeth of Large Gear: 54T Pinion Gear Teeth: 18T, 20T (One Each) Application: Suitable for Traxxas for X Maxx, for XO 1, for E REVO 2.0 RC cars. Package List 1 x Large Gear 2 x Pinion Gear 2 x Machine Screw 3 x Screw 1Steel Material: Gear is made of steel material and the gear surfaces is treated with antirust treatment for high wear resistance, corrosion resistance, good performance and long service life. 2Glossy Running: The more efficient drivetrain provides a smoother ride, making the mid drive gear transmission more glossy and powerful. 3Accuracy Machining: Accuracy machined for glossy gear rolling, with its own fixing screw holes for easy installation and simple operation, with machined screws included in the package. 4Improved Performance: providing improved gear meshing with great spare parts, the gears provide overdrive for the axle, giving you better performance on your RC car. 5Pinion: Speed depends on your gear ratio, available in 2 different gear ratios to give you more options in terms of gear ratios.