You may want to design your own springs to fit your equipment and tools, better look for company that carries stainless steel wire and music wire to allow you to create your own springs. You have a variety of lengths and gauges to choose from, which allows you to customize your springs according to the equipment you need them for. By the way, high-carbon spring steels are the most commonly used of all springs materials. So, try to use these materials in preference to others because that are least expensive, readily available, easily worked, and most popular. These materials are not satisfactory for high or low temperatures or for shock or impact loading.