Developed in 1997, the original Mach One rest is hand-carved from curly maple, matching the back of your instrument. Every maple Mach One shoulder rest is unique, elegant, slim, and light. The sculpted shape of the Mach One shoulder rests molds perfectly to your shoulder. The "S" shape fits comfortably on your shoulder and minimizes the size of the feet. These are molded from a single piece of rubber and have a lifetime guarantee. They will never touch the ribs of your violin or viola and will not scratch your valuable instrument.