Step up your puncture protection with Mr. Tuffy Tire Liners. These re-usable polyurethane strips form a protective barrier along the inside of your tire preventing inner tube punctures caused by sharp objects like thorns and broken glass.Mr. Tuffy liners are lighter than self-sealing and thorn resistant inner tubes effective against a wider variety of road hazards and they’re easy to install — no gooey mess. Sold in pairs enough for one bicycle.