Features 1、Made of high grade material steel, which is durable, solid and eco-friendly 2、Suitable for hsp1:10 RC Cars 3、Anti-rust and uneasy to deform 4、Easy and convenient to install 5、With long service life, a perfect accessory for RC motors Features: 1. Made of high grade material steel, which is durable, solid and eco-friendly. 2. Suitable for hsp1:10 RC Cars. 3. Anti-rust and uneasy to deform. 4. Easy and convenient to install. 5. With long service life, a perfect accessory for RC motors. Specifications: Teeth: 21T/29T/17T/26T 26T Size: 16.8 * 11 * 5mm / 0.66 * 0.4 * 0.2inch 21T Size: 13.7 * 11 * 5mm / 0.5 * 0.4 * 0.2inch 17T Size: 11.3 * 11 * 5mm / 0.44 * 0.4 * 0.2inch 29T Size: 18.5 * 11 * 5mm / 0.72 * 0.4 * 0.2inch Suitable Shaft Diameter: 3.175mm / 0.125inch Material: Steel Compatible RC Cars: Suitable for hsp1:10 RC Cars Suitable Model: For 94111PRO 94111 (17T, 21T), For 94107, 94170, 94123, 94103(26T, 29T) Weight: 41g Package Include: 4 x Motor Gears Package List