There is a gradual reduction of undercut, or initial slope into the main, or first cup, from the deeper B cup, to the shallow XS cup. This feature reduces the volume of the first cup. It also allows for more support in the upper register and a progressively brighter sound. The second cup is the convex portion of the cup that connects the first cup with the bore, or drill hole. Second cup dimensions are especially critical in determining resistance, definition of attacks, as well as the overall character and timbre of sound. Second cup dimensions in the Curry Standard Line are consistent throughout each diameter, so that a relatively shallow 3Z has many of the same sound characteristics as the deeper 3C or 3B cups.