The Rollz Motion air tires set includes front foam filled tires and rear pneumatic tires, and an air pump (Note: the pump supplied may differ from the one in the image). The air filled tires provide more shock absorption so you can drive more comfortable on uneven surfaces. These tires can be placed on the Rollz Motion and Rollz Motion Rhythm rollator walkers. If you currently have drag brakes on your rollator walker and wheelchair in one, then we advise you not to use it in combination with pneumatic tires. Note: If you buy this accessory you will need to put it on the rollator by yourself or ask help from a bike shop.