The ATM25/LE weighs 13.8 oz. Add the weight of an XLR cable, and the weight would easily exceed 1lb. This is why there is no instrument mount for the ATM25. However, there is a much better microphone for this application. The ATM350 is designed for use as a clip-on instrument microphone. It is a durable microphone, and only weights 0.5 oz. (that's correct, a half an ounce) and comes highly recommended for trombone use. If you would still like to use the ATM25, it will definitely need to go on a microphone stand.