The Winter Snowcontrol Serie 3 is Pirelli's Performance Winter / Snow tire designed to provide a high level of security on cold, dry, wet and wintry surfaces. The Pirelli Ecoimpact* icons on Winter Snowcontrol Serie 3 tires' sidewalls highlight the tire's contribution to the environment with regards to energy efficiency, clean air and low noise.Winter Snowcontrol Serie 3 tires feature a silica-enhanced winter tread compound that promotes rubber flexibility in cold temperatures. This compound is molded into a directional tread design that blends cold weather traction and handling. Rounded shoulder blocks and interlocking center blocks featuring Pirelli's Interactive Brickwork Siping creates a brick wall pattern that increases lateral and longitudinal stability while providing more biting edges to increase snow traction. Two wide circumferential channels and numerous lateral grooves help channel water and slush to the sides to enhance hydroplaning resistance and wet traction. The tire's internal structure includes twin steel belts reinforced by spirally wrapped polyamide that enhances thermal stability and makes the tires less sensitive to changes in road and air temperatures.Snow Wear Indicators (SWI) in the tread design identify when the remaining tread depth begins to deliver diminishing snow performance (in addition to the bottom-of-the-groove treadwear bars that indicate the tire is completely worn out at 2/32" of remaining tread depth). In the case of the Winter Snowcontrol Serie 3, notches of selected center rib blocks wear smooth when approximately 5/32" of tread depth remains.Winter Snowcontrol Serie 3 winter / snow tires meet the industry's severe snow service requirements and are branded with the three-peak mountain snowflake (3PMSF) symbol.Install Pirelli Winter Snowcontrol Serie 3 tires in sets of four only.Due to the traction capabilities of the Winter Snowcontrol Serie 3 tires, Pirelli recommends using them only in sets of four to provide the best handling characteristics and tire performance.*Specific sizes utilizing eco-focusing manufacturing methods are identified with Pirelli's Ecoimpact designation on the Sizes tab, as well as on the tire's Specs tab. Related Information: What is the three-peak mountain snowflake symbol (3PMSF)? | Environmentally Conscious Manufacturing