For more than a decade Z-Chain has been the winter traction product choice for police, fire, ambulance and other professional fleets throughout North America. Z-Chain’s fast installation, aggressive traction performance and extreme durability simply out-class all other options. Superior, all-around traction performance - Manganese alloy crossmembers provide long term durability, constant contact between the tire and road allow for maximum efficiency of anti-lock brakes (ABS) and all wheel drive (AWD), while diagonal patterns provide greater lateral traction for improved cornering and braking Fast, secure installation and removal - Can be installed without the need of moving the vehicle and without additional tensioners allowing for faster installation and safer installation when roadside Low potential for damage to vehicle body and mechanical components - Doesn't require tensioners that can scratch or damage alloy and the unique fastening system reduces fly-off, provides less road impact, and greatly extends chain life Meets class "S" clearance requirements - Z-Chain will meet class "S" clearance requirements on normal passenger cars and was designed for and has been widely used by police departments and emergency fleets Included with each pair of chains - Waterproof, illustrated, step-by-step installation and removal instructions, gloves with long sleeves, and a reusable nylon bag for storage