Halcyon uses only stainless steel products made from 316 stainless steel. You will see “316SS” stamped into the product. This grade of stainless steel has a high amount of chromium and nickel as well as molybdenum which results in a high degree of corrosion resistance. Importantly, the springs are also made from stainless steel so they will not rust through and render your double-ender useless. We offer them in two sizes for different hand sizes and applications. You will be interested to know that we hand test each double-ender for ease of use and return those to the manufacturer that do not meet our standards.