SPHD bias tire patches are designed to repair both flat and non-flat tires. Due to their excellent elasticity and sufficient strength, they are suitable for use on truck and tractor tires. For patching industrial tires, use stiffer ones. COTR sites. The design of SPHD patches makes them easy to use and allows patching even in the area close to the tire edge. NB! All damages (cracks. cracks. holes) must be filled. For cold vulcanization use blue "Maxibond Cement" glue.