Barrington BR CL236 B-Flat Clarinet Nickel plated keys- for added durability cyclindrical.577 bore for ease of blowing skin pads- for better coverage adjustable thumb rest-for added comfort Resonite,body and barrel- maintenance free playing and long lasting 336 clarinet-Feature 1-nickel plated keys- for added durability Cyclindrical.577 bore for ease of blowing Skin pads- for better coverage Adjustable thumb rest-for added comfort Resonite,body and barrel- maintenance free playing and long lasting