Made of high quality material, . Can be easily removed and replaced as part of normal maintenance. Easy to install and reliable to use. It is recommended that you regularly replace or thereafter to maintain the best performance of the machine. Colour:black Material:plastic style: Left wheel The actual product may have slight color difference or difference, which not affect the use Package Contents: 1 * robot wheel Only the above package content, other products are not included. Note: Light reflection 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.