This 200 x 50 Crazy Cart tube fits Razor electric scooter E100, E150, E200, ePunk. Also fits other scooters and ride-ons with inflatable tyres of size 200 x 50,Also written as 8 x 2 tubing. Made of isobutylene isoprene rubber, do not recap, which is better in air tightness, elastic cushioning and ageing resistance than natural rubber, can go up to 6 months without refilling and the shock absorption is also much better.This 8 x 2 bike tube uses a curved valve stem made of pure copper, which is more corrosion resistant and prevents leakage. The valve seat is coated with rubber to ensure a strong seal that prevents sand and dust from entering the hose and tyre, extending the service life.The 200 x 50 inflatable hose with curved air valve, pumps more comfortablyPackage includes: 2 packs of 200 x 50 e-bike inner tube (8 x 2 roller tube).