John Packer JP133MLR step-up Bb/F trigger trombone outfitIntroducing the John Packer JP133MLR step up Bb F trigger trombone outfit If you are looking for a reliable Bb F trombone but you cant justify the cost of a more expensive instrument, then the JP133MLR Bb F is for you. The JP133MLR is a medium large bore Bb F tenor trombone made from yellow brass with a gold lacquer finish and 8" rose brass bell providing a fullness and maturity in tone not usually found at such an affordable price. Ideal for students