Ideal Security's Garage Door Springs are compatible with standard 7 ft. high garage doors. Pack includes two springs and two safety cables to provide additional lifting power for manual or electric garage doors. Springs are durable OEM quality and rated for 12,000 cycles and tested up to 15,000. The new CRL technology (continuous radius loop) increases strength of the spring and prolongs its longevity. Safety cables reduce the risk of damage and injury if springs break. All springs in series are 25-inches long relaxed and 67-inches when fully stretched.Consult Ideal Security's Spring Selection Guide to choose the right springs for your door. It is recommended to replace springs with the same size as the original.Ideal Security garage door springs follow industry-standard color coding to indicate weight capacity. Some brands use blue on both their 90 lb and 140 lb springs, if your current springs are blue, ensure that you check door weight/spring diameter before ordering.