1、Durable Material: Made of high quality ABS and rubber materials, it is durable and can make the sweeper run more smoothly. 2、Easy Operation: It is easy to replace and install. It can be used only by fastening. It does not need other tools and does not take a lot of time. 3、Nice Replacement: It can replace your old, broken, loose, worn or missing front wheel casters with stable and reliable performance. 4、High Compatibility: It is suitable for Xiaomi 1S, S50, T4, T7, which can perfectly fit your machine. 5、Stable Performance: Professional manufacturing, craftsmanship and high accuracy help to provide stable performance to meet your various needs. 2 x Robot Sweeper Universal Front Wheel Item Type: Robot Sweeper Universal Caster Front WheelMaterial: ABS, RubberWeight: Approx. 60g / 2.1ozSuitable: for Xiaomi 1S, S50, T4, T7