Replacing all pads and head corks at a music store costs around 50,000 yen at the very least. This is a set for those who can replace pads themselves. ・C tube leather pad set (16 pieces) ・Head cork for the head joint (1 piece) The pads are a set of leather pads (16 for YAMAHA C tube flutes) used in vintage flutes/piccolos, etc. The head cork has a taper cut into it. Leather pads are water-resistant and less prone to tearing. Compared to regular fish skin pads, they last significantly longer (several times as long). Also, since there are no insect bites, even if the appearance of old fish skin pads is clean, there are often insect bites inside, and satisfactory sound may not be produced. However, based on my experience in sales of vintage instruments, I have found that leather pads can often be used with just adjustment, even on vintage instruments that have been left untouched for 40 to 50 years. Compatible with YAMAHA flutes 23/211/311/411. This is not a YAMAHA genuine part.