The JP135 is John Packer's Bb valve trombone. Ideal for valve players who want to dabble with a trombone without learning slide positions, the JP135 features a 0.484-inch bore, an 8-inch bell and nickel silver valves. The JP135 Bb also has applications for pit players where playing space needs to be kept to a minimum. This eye catching trombone is sure to turn heads and is a fun addition to players' instrument collection. - the manufacturer