Crafted from lacquered copper, the Harmon L Model Wow-wow is an effect trumpet mute designed to deliver the famous "wah-wah" sound. The trumpeters here at Sweetwater have noted the L Model offers a free-blowing feel and that it doesn't affect your pitch in any way. Harmon mutes have been used and endorsed by so many famous musicians for more than two decades, and we're confident that players searching for the best trumpet mutes for jazz work will be duly impressed by the L Model Wow-wow.