Feature: 1. APPLICABLE MODELS: Belt drive transmission gears system will not add extra burden to RC cars, suitable for Traxxas 1/10 RC full series models. 2. DURABLE MATERIAL: Belt drive gears system is made of premium aluminum alloy plus rubber, durable, wear resistant, prevent corrosion, and long service life. 3. LOW NOISE: RC belt drive transmission gear is a good solution to the noise problem of the tooth drive, belt drive basically no sound, so that the car is very quiet driving. 4. REALISTIC APPEARANCE: RC belt drive gear exquisite appearance and stable performance makes your RC car look more realistic, cool and practical. 5. REPLACEMENT: RC crawler car upgrade DIY parts are light weight, easy to install and remove, you can directly replace the old or damaged parts and get higher strength. Specification: Item Type: Belt Drive Transmission Gears System Material: Aluminum Alloy, Rubber 30T Gear Diameter: Approx. 32mm/1.26in Width: Approx. 8mm/0.31in Hole Diameter: Approx. 4mm/0.16in 12T Gear Diameter: Approx. 12mm/0.47in Aperture: Approx. 5mm/0.20in Belt Circumference: Approx. 114mm/4.49in Belt Width: Approx. 5mm/0.20in Tooth Distance: Approx. 3mm/0.12in Suitable for Traxxas 1/10 RC Series. Package List: 1 x 30T Large Gear1 x 12T Small Gear2 x Belt1 x Coupler2 x Grub Screw Note: 1. Due to manual measurement, please allow 1‑3mm error.2. Due to differences between different monitors, the picture may not reflect the actual color of the item.