Spare cap for storing Wind Instrument. Only needed on models up to 2018; not needed for Wind Instrument RB (with replaceable battery).
Dealer margin = $3.00 per unit if selling at Suggested Retail Price of $12.00.
Size can be adjusted using a hair dryer to warm up the Blue Cap, to make a custom fit for the size of the tail section on your Wind Instrument. Dip in water to cool it at the new size.