Tannus Armour Fat Tire Inserts with Tubes for 26"It's a helmet for your tubes. Tannus Armour provides 15mm of puncture protection on the top, as well as 2mm of sidewall protection. At the heart of Tannus Armour is our patented Aither Technology. Aither is a multi cell foam compound that forms the structure of the Armour. In the package: 1 Tannus Armour Tire Insert with Tube and Schrader Valve Fits a Fat Tire 26" Single Tire Insert (purchase two for a set)