All our sofas and chairs are made with the industry’s best coils and are backed by our exceptional 10-year frame warranty. The type of coil used in each sofa and chair depends upon the design and weight of the frame itself. Most of our frames are larger profiles that feature heat-tempered, double-coil steel springs that are eight-way hand-tied. The lower-profile frames that we offer feature non-sag sinuous coil springs. Specific information for each frame can be found on each item’s description page.