High quality butyl inner tube for Brompton wheel size with a Presta valve. Compatible with various inch sizes including 37-340 (16 x 1 3/8), 28-349 (16 x 1 1/8), 37-349 (16 x 1 3/8), 28-355 (18 x 1 1/8), and 35-355 (18 x 1.35). The base material is processed through seven filters prior to extrusion, and all hoses are placed in a mold for vulcanization and pumped up to ensure uniform wall thickness and high air retention. Schwalbe bicycle hoses are typically made of butyl rubber, which is very elastic. All of Schwalbe's inner tubes are 100% recyclable and are inflated for 24 hours and tested for leaks at the factory before being shipped. Schwalbe inner tubes have a very high butyl content and high material purity. SV stands for Presta. Weight: 85g.