Reinforced resin counter gear set for pinion gear 23T, 25T (25T requires some processing inside the case) Set Contents: 1 set (From Amazon.co.jp) Square R/C Oem Parts Top-Quality Materials & Superb Craftsmanship Preferred By Knowledgable Model Hobbists & R/C Enthusiasts Brand-New, Unused, Unopened, Original Packaging Easy To Diy Install Scale Model & Accessories Item Weight 0.352 ounces Manufacturer スクエア Item model number SWR-30 Product Dimensions 4.96 x 3.58 x 1.38 inches Manufacturer recommended age 15 years and up Is Discontinued By Manufacturer No