Material: Wheelchair tires are made of high-quality rubber materials, PU wheels, no inflation, not afraid of sticking, the walker wheels replacement is solid, durable, wear-resistant, and has a strong load-bearing capacity. Size: Wheel diameter 5 Inch/12.5CM, 10cm/4inch, wheel width 1.2 Inch/3.2cm, Maximum Load:120 kg, Center bearing internal diameter: 8 mm/ 0.3 inch. Scope of application : wheelchair rear tires are suitable for wheelchairs of the same size, most suitable for the wheels of most manual wheelchairs. Good stability: Smooth driving, have good stability when run on flat surface, without losting control or spin no reason, even wheelchair user can operate alone easily. Application: The 4 or 5-inch replacement wheels can be used for wheelchairs, transport chairs, rollators, knee scooters, walkers, ect.