REMA patches vulcanize without heat. Just buff the injured area, apply cold vulcanizing cement and apply the patch. Tube patches are designed to flex with tube; do not use on tires. Usa Rema's Cold Vulcanizing Cement. To make the job easier, we have a free REMA repair manual which covers step-by-step illustrations. Made in West Germany. Box of 100. NOTE: Store patches at room temperature away from sunlight.