Feature: 1. Applicable Model: RC car ball bearings are suitable for WLtoys 144001, 144002, 124018, 124019, 124017, 124016, 144010 remote control cars. 2. Stainless Steel Materials: The bearings are made of high quality stainless steell materials, which are durable, strong and have a long service life. 3. Smooth Surface: This stainless steel RC car ball bearing has a simple and smooth finish that will make your car look like a brand new one. 4. Product Size: RC car ball bearing outer diameter is about 7mm / 0.3in, inner diameter is about 4mm / 02in, thickness is about 1.8mm / 0.07in. 5. Easy to Install: Our metal bearings are specially designed for remote control vehicles. Multifunctional design, suitable for most RC car body modification. Specification: Item Type: Ball Bearing for Remote Control Car Material: Stainless Steel Color: Silver Weight: Approx. 3g / 0.1oz Product Outer Diameter: Approx. 7mm / 0.3in Product Inner Diameter: Approx. 4mm / 02in Product Thickness: Approx. 1.8mm / 0.07in Applicable Model: for WLtoys 144001, 144002, 124018, 124019, 124017, 124016, 144010 Remote Control Cars. Package List: 4 x Bearing