Clarinet maintenance cork sheets, a joint cork set. This set includes 5 sets of 4 cork sheets each: lower joint, upper joint (top), upper joint (bottom), and mouthpiece, totaling 20 sheets. All sheets are pre-cut to the necessary sizes. This set can repair 5 clarinets. They are pre-cut to clarinet sizes and ready to use. Made from natural Portuguese cork, processed in Japan. Suitable for wind instruments and woodwind instruments. These are items handled by the last person in Japan who processed and manufactured cork specifically for musical instruments. This person was well-known in the musical instrument repair industry. Many of their products were supplied to instrument manufacturers like Yamaha. These are being sold now due to the deceased's will to supply them at a fair value to those in the instrument repair industry. Sales will end when stock runs out. The workshop is closed, so there will be no more Japanese-processed cork products available in the market. Please understand that commercially available cork may be bleached or have holes filled with powder, while these natural cork sheets retain their natural spots and holes. Proceeds will be used for the activities of protecting cats. Instrument adjustment, maintenance, instrument workshop, wind instrument repair workshop, cork replacement, overhaul, wind instrument repair.