Made of high-quality plastic, offering high processing durability and good wear resistance. Smooth design helps prevent floor scratches. Dirt-resistant and equipped with quiet wheels for noise-free operation. Use a flat-blade screwdriver to remove the old wheel by pushing it up, then install the new wheel into the groove. (Note: these are smaller front wheels, not larger rear wheels.) Compatible with Shark NV350, NV352, NV355, NV356E, NV500, NV501, and other general models. Installation Instructions: Use a flat-blade screwdriver to push up the old wheel, then insert the new wheel into the groove. Product name: Shark vacuum cleaner floor brush small wheels Color: Gray Material: Plastic Package Contents: 2 pairs x wheels Only the above package content is included; other products are not included. Note: Light and display differences may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.