Sealant filled butyl tubes for everyday commuting or training. Auto fix tubes are made with high quality synthetic rubber with a wall thickness of 0.9 mm and filled with a specific sealant to seal punctures within seconds. The sealant improves the air retention. Available with Presta or Schrader valve in all common sizes Butyl tubes filled with sealant, It seals punctures within seconds, Sealant improves air retention.Features:Material: Butyl, Valve: Schrader/Presta, Core: RVC 48mm.