Wheelchair rear wheels:the wheels are made of aluminum alloy,sturdy and resistent.The tires are made of rubber with pneumatic inner tube.Antis-impact,antis-skid,wear-resistant. Wheelchair Replacement Wheels:quick release design,very easy to mount,save time and labor.Suitable for most manual wheelchairs,sports wheelchairs. Wheelchair rubber wheels:antis-skid texture design of the tread,suitable for indoor and outdoor many road surfaces.The wheels have built-in double bearings,high speed and low damping,easy to push the wheelchair. Manual wheelchair rear wheels:of the hand push rings can be adjusted with the distance between the wheels.Before purchasing,please pay attention to measure your old wheel size,and mounting hole size. Wheelchair wheels:model 24×1(25-540),wheel diameter 600mm,bearing hole diameter 12.7mm(1/2").Package includes:wheel x 2,quick release screw axle x 2.