Broad Compatibility: replacement front wheels are designed for Navigator Rotator, Compatible with models NV350, NV351, NV352, NV355, NV356e, NV500, NV501, NV502 NV42 NV22 NV31 NV70 More Excellent Quality: replacement wheels for Navigator Rotator, that made of high-quality PE material, and soft, which 't damage floors. Installation Instructions: Easy to install, using a flat-blade screwdriver to push down the old small wheels, and then install the new wheels. Keep healthy and clean: it is recommended to check the vacuum wheels regularly and replace the worn wheels to help maintain the vacuum performance and bring you a healthier life. Please confirm your model to a suitable replacement. color:as shown Material:plastic Package Contents: 8 x vacuum wheel 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.