The Stratosphere rim is wide and medium round to flat, with some undercut for chop room and soft bite. The cup is a very shallow drop V (similar to Bach F). The Legends enhanced throat (#27), enhanced throat cylinder length, and Legends S backbore work together to maximize endurance, range and sound with this model. Slotting is excellent with the Stratosphere. Customers that have purchased this model have enjoyed using it for extreme and extended upper register playing. This piece can help you master the stratosphere!