A Schwalbe bicycle tube is predominantly made of Butyl rubber. Butyl is a very elastic and airtight synthetic rubber. This high elasticity Schwalbe tubes allows a wide range of different tire sizes to be covered. Specifications: Brand: Schwalbe Wheel size (inch): 14 / 16 Valve type: Presta valve (Sclaverand) Valve length: 40 mm Valve diameter: 5,9 mm Maximum valve pressure 15 bar (Keep the maximum tire pressure in mind) This inner tube is suitable for tires with INCH size: 14 x 1.75 14 x 1.90 14 x 1 1/4 14 x 1 3/8 14 x 1 1/2 14 x 1 5/8 14 x 1 5/8 x 1 3/8 16 x 1.50 This inner tube is suitable for tires with the ETRTO size: 40-279 37-288 40-288 44-288 47-288 32-298 37-298 40-305 This inner tube is suitable for tires with the French size: 350 x 32A 350 x 35A 350 x 38A 350 x 38B 350 x 42A