Our eBay Store About Us PREMA Center-Over-Injury Repairs are designed for use in the Crown, Shoulder and Sidewall area of radial tires. They can be installed by either Chemical (COLD) vulcanization or Heat & Pressure (HOT) methods. For COLD application, install using PREMA Ultra Fast Dry Vulcanizing Cement. For HOT applications, install using PREMA Black Vulc Cement. Manufacturer Part Number: PR-115 FeaturesPatch size: 3" x 3-1/4"Center-Over-Injury Repairs are designed for use in all radial tiresIntended for use in hot or cold applicationsDesigned for use in crown, sidewall, and shoulder of radial tiresInstall with Prema Ultra Fast Dry Vulcanizing Cement We try to describe our items as accurately as possible. Feel free to e-mail us with any questions you may have. E-mails sent in the evening or over the weekend will be answered as quickly as possible the following business day.