Thank you for viewing. ◆Product Overview◆ YAMAHA Mouthpiece Patch 0.3mm M size (for alto saxophone, tenor saxophone, baritone saxophone, B♭ clarinet, alto clarinet, and bass clarinet) 1 piece I purchased this several years ago. After using one sheet, I disposed of the instrument, so I stored it in a bag in a dark place. I haven't touched it much, but as you can see in the image, there is some yellowing. Please consider this only if you don't mind, as some time has passed since the purchase. Instant purchase is welcome. I will ship it with waterproof packaging. #YAMAHA Musical Instruments