(Image shows SS-4CM mouthpiece)
Yamaha Custom  Series saxophone mouthpieces are sculpted out of choice ebonite, a  high-quality hard rubber which offers a deep resonance and tonal  qualities similar to those of natural wood. Every step of the  production, from the initial shaping of the mouthpiece ‘blank’ to the  final hand crafting of the facing, is done by Yamaha’s experienced  artisans for complete control ensuring consistent high quality.
Yamaha  has spent years working together with many of the world’s greatest  musicians, studying their mouthpieces and discovering ways to improve  them. The Custom Series incorporates this experience in the design and  manufacture of every mouthpiece in the series. The Custom Series  mouthpieces are characterized by a warm rich tone with exceptional  clarity. Their accurate intonation and comfortable playability have made  them popular with many leading artists.