This hobby horse spring from Prime-Line is constructed from 0.125 gauge heat-tempered spring steel wire plated in a bright nickel finish. It offers superior strength and long lasting tension. This spring features a single loop open-ended design and measures 5-1/2 inch in length by 1-1/16 inch in diameter. This type of spring can be used to replace most hobby horse springs and works for a variety of other household applications.