Made of high quality materials, more durable,Exquisite and delicate, highly matched with original equipment Assist your robot to change the walking direction Insert the universal wheel into the corresponding position on the machine body firmly As part of normal maintenance, it can be easily removed and replaced Fitment: For RoboVac 11S RoboVac 30 RoboVac 30C RoboVac 15C Colour: black Material: plastic + stainless steel Size: 4.9cm Package Contents: 1 x Universal Wheel Only the above package content, other products are not included. Note: Light 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.