Referral rewards ONLY qualify when offered to a new individual. Kala Brand Music Co. reserves the right to revoke any Kala coins or discounts generated by any individual found to be sending invitations to themselves (via alternate email address(es) or other methods). Kala coins cannot be used on Revelator Nautilus Horizon and USA ukuleles, Kala Metropolitan Deluxe Series, and California U•BASS®.