Once you purchase a flute from me, you would have seven business days from the day your receive it to try it and make sure it's a fit for you.  

If you decide you need to return it, you would let me know, and then you would ship it back to me on or before the eighth business day in its original condition with tracking for a full refund minus shipping (no insurance is required).  You would pay for shipping.  Once I have it back in my hands in its original condition, I would immediately refund the purchase price of the flute.

Any damage done to the flute while on trial is your responsiblity unless you can prove that it was beyond your control (for example, an act of nature).

As you probably guessed, once you keep the flute past the eighth business day, the guarantee is expired.

Please let me know if you have any questions at all.