Xtra Seal 2-1/4" Round Universal Quilled Combination Units have rubber reinforced patch heads. They are multidirectional and can be applied in any repairable area of radial or bias-ply tires (tread, shoulder or sidewall). The repair unit is black with black vulcanizing gum and both the stem and the repair unit will vulcanize chemically effecting a perfect repair. The stem of these units are equipped with a metal quill for easy installation. For chemical vulcanization only. Packaged 15 per box. Ascot Part #587-13382.