and durable. Make of excessive Bearing Steel,Deep Groove .. Widespread bearing,economic and standard. Less Friction, Higher Speeds and Durability. Special no touch dual rubber seals to seal out dust while providing friction unfastened performance. Easy Installation & Replacement. Suitable for: TT02 TT-02 TT02D TT-02D 1/10 RC Car Tool Supplies:Assembly Category RC Parts & Accs:Servo Accessories Use:Vehicles & Remote Control Toys Technical parameters:Value 2 Remote Control Peripherals/Devices:Receivers For Vehicle Type:Cars Four-wheel Drive :Assemblage Wheelbase:Screws color:Silver+blue Material:metal+rubber Package Contents: 4 x Ball Bearing(5x11x4mm) four x Ball Bearing(8x12x3) 8 x Ball Bearing(5x10x4mm) Only the above equipment content, different merchandise aren't included. Note: Light reflection and diverse reveals could cause the color of the thing within the picture slightly various from the genuine thing. The measurement allowed error is +/- 1-3cm.