Spare wheels for Narwal J1/j2 vacuum cleaner robots. 100% Brand new and high quality Made of high quality material, more durable. As part of normal maintenance, it can be easily removed and replaced. For best results, wheels should be replaced every 1-3 months. Note 5 screws: for Cloud Whale J1 (universal small wheel) 3 screws: applies to Cloud Whale J1/J2 (universal large wheel) 5 screws can only be used for J1 cannot be universal Color: black Material: ABS Style: 5-small Size/3-Large Size Package Content: 2 x WheelOnly 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 slightly different from the real thing. The measurement error allowed is +/- 1-3cm. Shipping time: All products we can ship within 5 ~ 8 business days