General purpose butyl inner tubes for everyday use. Standard inner tubes are made with high quality synthetic rubber with a wall thickness of 0.9 mm. Standard tubes offer good puncture resistance and a solid airtight performance in every instance. These tubes are puncture resistant and perfect for everyday use. They are made from butyl rubber and feature a Presta valve with a 48mm core. The size is 700c with a width of 20/28c, weighing 116g.