To commemorate the 10 year anniversary of the original Mach One shoulder rest, Peter Mach has introduced the new M07 model that keeps the same famous ergonomic shape while minimizing the amount of material used. The Mach One M07 shoulder rest is made from a high-tech double-injection mold. The main body of the rest is resilient and strong, while the contact surface is made of a soft, grooved, rubberized compound, similar to what you might find on your toothbrush, for an incredible grip. Plus it is easily washable!.