Bocal screw Yany BooStar for YANA. and Selmer Special alloy, un-coated Yanagisawa S-bows

S-bow screw made from a special alloy
With black engraving, suitable for Yanagisawa and Selmer saxophones
One base screw and two additional screws with different weights
This allows for three possible combinations for individual sound design
Special alloy, uncoated
For more overtones and voluminous sound