An inner tube from Schwalbe maintains air pressure significantly longer. The quality of the components and the purity of the rubber compound are decisive for the quality of the inner tube. Article number: 10416310 EAN: 4026495100243 Brands: Schwalbe Model: AV7a Material: Butyl Length Ventien (mm): 40 Valish type: Shrader (Shrader (Car) Compatible outer tire: 20 " Net weight (G): 105 Inner tire size (Etho) 37 -438/37-451 37 - 438/37 - 451 37 - 438 37 - 451 Inner ribbon size (French): 500x28a / 500x35a Inner ribbon size (inch): 20x1.1 / 8 / 20x1.3 / 8 Band type: inner tire Bandwidtte: 37 Inside or outer tire: inner tube (Etro) Tire size 37 - 438 37 - 451 Color.: black Product specifications: Valve type: Car / Schrader Valve length: 40 millimeters Weight: 105 grams Tire sizes: 37-438 - 20 x 1 3/8 28-440 - 500 x 28a 37-440 - 500 x 35a 28-451 - 20 x 1 1/8 37 -451-20 x 1 3/8 inner tube Schwalbe SMAL 20 inch Car-AV7a / 37-438, 28-440, 37-440, 28-541, 37 -451. Inner tubes from Schwalbe are reliable. Bicycle retailers appreciate its reliability. Each tire is inflated in the factory and can be tested for air opportunity for 24 hours. The tire maintains its air pressure for longer. In production, Schwalbe requires a very high butyl content and cleanliness of material. For example, the inner tube of Schwalbe retains air pressure significantly longer than other inner tires. This is a system of group insistence treads: an inner tread of Schwalbe is extremely elastic and adapts to several tire sizes. Consequently, they are called inner-tube groups. For example, the inner tube with the number 19A for tire sizes from 27.5" to 29" and for widths from 40 to 62 mm. Finally, the group is 100% completely recyclable. Standard version: high reliability, proven over many years.