The ITW Global Brands 30012 8 inch Slime tube helps seal punctures up to 1/8 inch and helps prevent flats. The tube can be installed before a puncture occurs as a pre-treatment. It can also be used to help repair slow leaks or flat tires. This wheelbarrow tire tube works instantly, repeatedly and installs quickly. Simply remove the valve core from your tire, inject Slime, re-inflate and rotate it. The tubes are pre-filled at the factory with the required amount of Slime.