Selmer mouthpieces are highly regarded as a standard for saxophone mouthpieces. The S90 is easy to play and produces a beautiful tone, making it suitable for various genres. It is widely used by players of all levels, from beginners to advanced players. The chamber is slightly large, designed for good resonance. It is also the model included with Selmer saxophones. The Selmer S80 series, or the S90 series, are fundamental when discussing mouthpieces. Please be aware of this if you are sensitive to such details.