Upgrade your HPI Nitro 3 with this high-quality purple aluminum threaded pinion gear. Made in Taiwan, this gear is compatible with 1:6, 1:8, and 1:10 scales and works with both electric and nitro & glow fuel types. Suitable for ages 8 and up, this HPI CAR/TRUCK PART is perfect for RC enthusiasts looking to improve their vehicle's performance. Don't settle for anything less than the best - choose HPI.