set2: 2 x Black tire skin + 2 x White tire skin & 5 x wheelsMade of high-quality wheels, more durableIt is recommended to replace the accessories of the sweeper regularly to improve the cleaning efficiency and the service life of the sweeper1. Made of high-quality materials, wear-resistant and anti-aging2. Easy to install and use3. Reduce tire wear, anti-skid, and increase tire life.4. Replace damaged, broken, unusable tire skins5. Perfect match with Xiaomi Mijia Robot Vacuum CleanerSize:50 x 45mmFlattening length: 130mmCompatible models: Xiaomi 1S 2S 1C T4 T6 or Roborock S50 S51 S55 S6 S4 S5 MAX.Colour: black + white/blackMaterial:plasticSize: Width: 15mmPackage Contents:2 x Black tire skin2 x White tire skin5 x wheelsOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. About tracking number update: If your tracking number is no logistics information, as thousands of parcels sent to foreign countries, logistics companies did not update logistics information, please contact us the first tim