We used in a Yamaha YTR 5335 gsii trumpet that fits without problem with space to spare. The cork fits snug in the bell without dropping out, time will tell. Little difference in weight worthy of note, compared to other mutes. Used mainly without the centre tube, it gives a warm darker sound than the brighter Harmon mute that was purchased to compliment this one. Aesthetically bright copper that will not doubt dull over time, it is a mute worthy of the tool bag. No problems as yet with intonation or back pressure so all good!