Vento VE5318 500 Series Model 5318 Valve Trombone The Vento 5318 valve trombone will be at home in your concert or jazz band with a .480 bore, three stainless steel pistons, and an 8" bell. Includes deluxe case and mouthpiece. .480" Bore 8" Bell 3 stainless steel pistons Includes deluxe case and mouthpiece