note: Ordinary tires (outer tires with inner tubes are ordinary tires) The original ordinary tires cannot be directly replaced by vacuum tires. For details, please consult the car sales agent Vacuum tire (vacuum tire without inner tube) Vacuum tire plus matching inner tube can be used as ordinary tire Model: pneumatic tire Units for sale: inner tube + outer tube (1 set) Material: outer tube [rubber]; inner tube [butyl rubber] Specification: 8 1/2X1.5 [40-120] Level: 4pr Load capacity: 150kg Maximum air pressure: 250 Size: Reference picture Applicable models: electric wheelchair/scooter/baby carriage, etc.