Standard Replacement Woodwind Mouthpieces are smooth and resonant. Over 80 years of experience goes into every Standard mouthpiece for unsurpassed versatility and quality. Standard TMK mouthpieces are made of sculptured, black plastic. They are expertly crafted with medium, medium open and open lays for Bb and bass clarinets, and alto, tenor, and baritone saxophones. You’ll appreciate the deep resonance that comes from precision facings and acoustically balanced chambers.