Ideal for the advancing student and professional. Crafted using a groundbreaking new digital vamping process, for ultimate quality control, precision, and consistency. Expertly designed and made in the USA from naturally-grown cane from D'Addario's own foreign fields. Available in half strengths, from 2.0 to 4.5, with special 3.0+ and 3.5+ strengths. The Reserve line also includes options for Bb clarinet, Eb clarinet, and all saxophone voices. .