Tannus Armour Fat Tire Inserts help to extend the life of your tires by providing an added barrier of protection against goat heads, rocks, sticks, and all of the pesky nuisances that cause a headache out on the trails. The Tannus Armour Fat Tire Inserts provide 15mm of puncture protection on the top of the tire, plus 2mm of sidewall protection. Tannus Armour Fat Tire Inserts are compatible with 4.0”-4.8” tires and come with tubes that will replace your current 4.0” tire tubes. Package contains 2 Tannus Armour Liners & 2 tubes specific for Tannus Tire Liner Inserts.