Drum Muff Four Scored - Drum and Cymbal Dampening EXPERIENCE AN ENTIRELY BETTER SOUND  Patent Pending Drum Muff: 100% Satisfaction Guarantee! Drum Muffs enhance the sound of drums using a proprietary blend of aluminum and rubber. 4 Mils of aluminum are bonded to self adhesive rubber. The patent pending blend offers gating, volume reduction and overtone elimination  either singularly, or as a trio (depending on sizes used and placement). Drum Muffs actually enhance the sound of your drums and allows for a bit of ring and still lets them be open sounding. Starter set comes with one large, one medium and one medium scored to be cut into four small.