The ContiWinterContact TS830 P ContiSeal is a Performance Winter / Snow tire that was developed for the drivers of sporty coupes and family sedans looking to combine traction on dry, wet and snow-covered roads with the additional peace of mind their travels will not be delayed by typical tread area punctures. Designed to deliver self-sealing continuing mobility, ContiWinterContact TS830 P ContiSeal tires feature a sticky, viscous coating on the inside of the tire that instantly seals nail or screw punctures up to five millimeters (approximately 3/16") in diameter. The ContiSeal coating is designed to permanently fill the path of the puncture when the object is removed.ContiWinterContact TS830 P ContiSeal tires feature an asymmetric tread design with broad, rounded outboard shoulder blocks to enhance dry road handling. These are combined with independent inboard tread blocks separated by wide circumferential grooves to enhance wet road traction and hydroplaning resistance. The independent tread blocks incorporate high-density sipes to provide the biting edges to help grip snow and ice and enhance winter traction without resorting to traditional metal studs.ContiWinterContact TS830 P ContiSeal Performance Winter / Snow tires meet the industry's severe snow service requirements and are branded with the three-peak mountain snowflake (3PMSF) symbol. Install Continental ContiWinterContact TS830 P ContiSeal tires in sets of four only.Due to the traction capabilities of the ContiWinterContact TS830 P ContiSeal, Continental recommends using ContiWinterContact TS830 P ContiSeal tires only in sets of four to provide the best handling characteristics and tire performance. Related Information: What is the three-peak mountain snowflake symbol (3PMSF)?