Hot Racing 15t Steel Mod 1 Pinion Gear 5mm NSG15M1 Made by Hot Racing; Hot Racing is a United States based company; parts are sourced from Chinese producers All Hot Racing upgrade parts are direct replacements for stock components; additional parts are not required Hot Racing part number NSG15M1; UPC 083745676235 This item works with: Associated RC-8 buggy, RC-8 Truck; HPI Electric Apache C1 or SC; Losi 1:10 SCTE short course, 1:8 8ight Nitro, 1:8 8ight-E, 1:8 LST, LST2, or Aftershock, 1:8 Muggy 4wd Truggy; Traxxas XO-1