Serial-numbered sports card parallels in this collection are printed in a limited run and stamped with a number out of the total, such as 25/99, across NBA, NFL, soccer, AFL and UFC. Every card is checked against its printed serial number before listing.
A serial number, such as 25/99, shows the card is one of a limited printed run of that parallel, stamped directly on the card.
Numbered vs refractor, what's the difference?
Numbered refers to a limited print run marked with a serial number. Refractor refers to a specific reflective foil finish, and a card can be both at once.