Jo Ral Embouchure Mirror This unique accessory allows players to see their embouchure as they play, making is easier to improve their technique It can be used on a trumpet or trombone This unique accessory allows players to see their embouchure as they play; making is easier to improve their technique Attaches to the mouthpipe of a trumpet or trombone This unique accessory allows players to see their embouchure as they play; making is easier to improve their technique