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. Three sizes of Tannus Armour Fat Tire Inserts are compatible with either 26" x 4.0"-4.8", 24" x 4.0"-4.8", or 20" x 4.0-4.8" tires, and come with tubes that will replace your current 4.0" tire tubes. The 26" x 4.0-4.8" and 24" x 4.0-4.8" packages contain TWO Tannus Armour Liners & TWO tubes specific for Tannus Tire Liner Inserts. The 20" x 4.0-4.8" package contains ONE Tannus Armour Liner & ONE tube specific for Tannus Tire Liner Inserts.