1、EXCELLENT COMPONENTS: High purity copper winding maximizes efficiency. High strength magnet has low friction and low noise. Replaceable external carbon brush, can work for a long time. 2、PRECISE DESIGN: Precisely designed, can achieve maximum energy conversion. The rotor is precisely balanced, with improved reliability and maximum speed for smoothness. 3、540 BRUSHED MOTOR: Featuring high torsion, exquisite circuit design, strong anti interference ability, bidirectional bearing, strong magnetic force, low heat generation, and high power. 4、SENSITIVE AND STABLE: Power distribution is sensitive, providing a smoothly vehicle start and preventing the car from shaking and stalling during startup. 5、HIGH PERFORMANCE: The 1/3 reduction gearbox has ultra high performance, effectively protecting the gearbox motor body and increasing high torsion output. Item Type: RC Car Motor Gearbox Kit Material: Iron, Copper 540 Brushed Motor: Length: Approx. 53mm/2.09in (Excluding Shaft) Diameter: Approx. 36mm/1.42in Shaft Length: Approx. 10.5mm/0.41in Shaft Diameter: Approx. 3.175mm/0.13in 1/3 Reduction Gear Box: Deceleration Ratio: 1:4.2 Total Diameter: Approx. 36mm/1.42in Total Length: Approx. 44.5mm/1.75in Shaft Length: Approx. 15mm/0.59in Shaft Diameter: Approx. 3.175mm/0.13in 15T Gear: Diameter: Approx. 8.3mm/0.33in Length: Approx. 10mm/0.39in Aperture: Approx. 3.175mm/0.13in Applicable: Suitable for Tamiya 1/14 tractor, 1/10 off road, climbing vehicle DIY modification 1 x 540 Brushed Motor 1 x 1/3 Planetary Gearbox 1 x 15T Gear 2 x Gasket 2 x Set Screw