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All of Schwalbes inner tubes are 100% recyclable and are inflated for 24 hours and tested for leaks at the factory before being shipped. Schwalbe inner tubes all have a very high butyl content and a high material purity. AV2 14" Inner Tubes: * Size: 14" x 1 3/8" * AV = Schrader * 40mm Valve * Weight: 85g