Use a flat-blade screwdriver to push up the old wheel, and then install the new wheel in the groove. (Please note: these are smaller front wheels, not larger rear wheels.) Made of high-quality plastic, high processing durability, good wear resistance, smooth enough to prevent vacuum scratching the floor, dirt-, quiet wheels, and no noise. Compatible with 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 new wheel into the groove. Product name: vacuum cleaner floor brush small wheels