Tru-Flate 14-153 Tire Patches Tru-Flate Chembond Tube and Bias Ply Tire Repair Patches ensure the repair gets done right For use on tubes and with bias ply tires only - do not use on radial tires When patching a tire, always prep the surface with a liquid buffer/cleaner then rough up the surface with a manual or rotary buffer; a thoroughly prepared surface ensures patch adhesion and safety 2-1/4 inch round patches feature a pure rubber flow into injury and can be applied with universal cement or an electric vulcanizer Box of 30 patches