These wheels are specifically designed for use with FS90R micro continuous rotation servo and also fit the Mini 360 degree continuous rotation servo. The wheel presses onto the servo spline just like a typical servo horn, and the small screw included with the FS90R accessory pack for mounting servo horns should be used to hold the wheel in place. The wheels have silicone press fit tyres and measure 60mm in diameter. Features: * Silicone press fit tyres. * Ideal for use with a Mini 360 degree continuos rotation servo. Contents: * 1 x Black Wheel for FS90R Micro Servo, 60×8mm. Dimensions: * Diameter: 60mm. * Tyre Width: 8mm.