Made of high-quality plastic, high processing durability, good wear resistance, smooth enough to prevent vacuum scratching the floor, dirt-resistant, quiet wheels, and no noise. Use a flat-blade screwdriver to push up the old wheel, and then install the wheel in the groove. (Please 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 the old wheel upwards, and then put the wheel into the groove. Product name: shark vacuum cleaner floor brush small wheels<br><br>colour:gray material:plastic<br><br>Package Contents: 1 pair x wheels<br><br>Only 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.