In Stock. 45 Day Lowest Price - 100% Satisfaction Guarantee. The Trumcor mutes are carefully handcrafted with wood and a specially formulated resonant fiber material. These are durable mutes that are designed to produce an in-tune, vibrant, warm and responsive sound that blends well with other instruments.This cup mute is suitable for symphonic, studio or solo playing. Its adjustable cup allows for a great variety of tonal flexibility. The Classical Cup is responsive and in tune throughout all registers.