RC enthusiasts, listen up! Need to fine-tune your 1/10 scale buggy or truck's gear ratio? This TOOYFUL set gives you five different pinion gears to experiment with. Specifically, this pack includes tooth counts from 26T up to 30T (that's 26, 27, 28, 29, and 30 teeth). They're all 48 pitch (48DP) with a 3.175mm bore, which is a super common size for many 1/10 scale brushless and brushed motors. The gears are made from hardened steel and have a tough hard-anodized surface treatment to resist rust and wear. They're also precisely ground for smooth, quiet meshing with your spur gear. A handy feature is the included set screw (a strong 12.9 grade) on each pinion to lock it securely onto your motor shaft. Whether you're looking for more top speed or better acceleration, having a selection like this lets you dial in your setup perfectly. A must-have for any serious RC tuner's toolbox.