The internal bore design of the Selmer CL301 compares to many professional handmade Bb clarinets. The use of carefully located tapers (conical) and straight (cylindrical) sections creates a smooth, consistent scale. The Selmer CL Series clarinets enable musicians of all ages and abilities to produce a refined, resonant tone quality.The shape of the Selmer CL301 clarinet bore ensures that is plays in tune with itself; play a low G, add the register key to produce the D a twelfth above, and check the pitch of both notes