REMA patches vulcanize without heat. Just clean the injured area with pre-buff, then apply cold vulcanizing cement and apply the unit. Use this molded repair unit on bias (non-radial) tires with REMA Special BL Super Cement. To make the job easier, we offer a free REMA repair manual which covers step-by-step illustrations. Made in West Germany. Box of 30 NOTE: Store patches at room temperature away from sunlight.