Mach One Shoulder Rest The original rest is hand carved from curly maple, which beautifully matches the back of the instrument. Mach One Shoulder Rest The original rest is hand carved from curly maple, which beautifully matches the back of the instrument. Every maple Mach One rest is unique, elegant, slim and light. Players love the natural look of the wood and have noticed that the rest actually improves the sound of their instrument. The sculptured shape of the Mach One molds perfectly to your shoulder. With this ergonomic design you have the option of adding the comfortable suede leather pad. The Mach One features a simple but fully adjustable design (width and height), whose graceful curves complement the instrument. The "S" shape fits comfortably on your shoulder and minimizes the size of the feet. These are molded from a single piece rubber and have a lifetime guarantee. They will never touch the ribs of your violin or viola and will not scratch your valuable instrument. The Mach One shoulder rest has quickly gained international respect and recognition not only because of its functionality, but for its simplicity and elegance.