This is a great mute and sounds great, but has a major problem - the corks. All 3 of the corks had fallen off within the first week of me receiving this item, and in my naivety, I attempted to fit it myself rather than return it. This is an issue I have personally faced with a couple of Denis Wick mutes including the Bass Trombone Cup and Carbon Fibre Straight Mutes as well as this one