DIMAVERY TT-300 is a Bb tenor trombone with a bell made of high-quality brass, a brass and nickel-silver tuning slide, and a high-quality lacquer finish. The instrument has a 1.39 cm bore and a 215 mm bell diameter. It weighs 3.35 kg and is finished in gold. The product is manufactured by DiMavery and has manufacturer article number 26505540.