The EBB231 is a BBb student model tuba employing top-action valves. It is a three-valve tuba that is easy for beginning tuba players to handle and play in tune. An excellent entry-level instrument, the EBB231 is one of the most popular student tubas available today. The top-action valves are designed "euphonium- style" within the general frame of the instrument, offering good protection of the valve assembly. Key of BBb 3/4 size tuba with 14 3/8" yellow brass bell Yellow brass construction with rose brass leadpipe and nickel-silver tuning slides Three stainless steel pistons through a .661" bore Durable, hard-shell ABS case with wheels