The dynamic Liberty Cup Mute features an adjustable cup allowing you to dial in a variety of sounds. By removing the cup, you have a great sounding straight mute. Liberty aluminum mutes are known for their high-quality craftsmanship and materials, excellent playability, while being value priced. Free-blowing and well-balanced in all registers. Made of high-quality spun aluminum with long-lasting cork. Felt lining tip helps prevent scratches & noise.