A. 1. It has high temperature resistance, corrosion resistance, and wear resistance. 2. It is equipped with a high - speed nylon cage and is suitable for extreme environments. 3. The bearing has dust covers on both sides, which can prevent lubricant leakage and block contaminants from entering. 4. It has a small size and is easy to carry and install. B. Precautions: It is advisable not to let the bearing bear jumping or other strong impact actions. C. Bearing type: Hybrid ceramic bearing Dust cover: Double - sided dust cover Material: Hybrid material Color: Black + Red D. Package contents: 8 skateboard wheel bearings Only the above package contents are included, and no other products are included. Friendly reminder: Due to light reflection and different monitors, the color of the items in the picture may vary slightly from the actual ones. The measurement tolerance is ±1 - 3 cm.