Ideal Security SK7155P2 SK7155 Extension Kit 2-Pack of Garage Door Springs & Safety Cables, Two, 140 lbs Blue Enamel coated steel springs are tested to be durable and long-lasting. Rated for 10,000 cycles (a cycle is 1 open and 1 close) BEFORE BUYING: Watch our how-to videos to be sure you've selected the right springs and are comfortable installing them yourself Garage door springs are color coded for easy identification. See our easy to use selection guide for help choosing the right springs SK7151: 90lb (Light Blue), 1.1" diameter SK7153: 120lb (Green), 1.34" diameter SK7155: 140lb (Dark Blue), 1.50" diameter. Note that some other companies use blue for both 90lb and 140lb springs. If your springs are blue, double-check the door weight or spring diameter SK7157: 160lb (Brown), 1.60" diameter SK7159: 180lb (Gold), 1.75" diameter All our springs are for standard 7' high doors. 25 inches relaxed, 67 inches when fully stretched Add SK7136 Safety Cables for added safety