Replacement wheels for Narwal J1/j2 Vacuum Cleaner Robots. and high qualityMade of high quality material, more durable.As part of normal maintenance, it can be easily removed and replacedFor best results, wheels should be replaced every 1 - 3 months.Note5 Screws : For Cloud Whale J1 (Universal Wheel Small)3 Screws: Applicable To The Cloud Whale J1/J2 (Universal Wheel )5 Screws Can Only Be Used For J1 Can Not Be UniversalColor: BlackMaterial: ABSStyle: 5-small sizePackage Contents: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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.