DESCRIPTION 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 inner tubes offer good puncture resistance and a solid airtight performance in every instance. SPECIFICATIONS Various size options available High quality synthetic Butyl rubber Good puncture resistance FAQ 1. I ride a mullet bike setup - should I carry spare tubes for both wheel sizes? No, a 27.5 tube will work fine to get you home on a 29" wheel if you are in a bind. 2. Can I put sealant inside tubes? Yes - but check the type of sealant you want to use - some works perfect inside tubes, but will state that on the product.