This set is all game-used letters that are 1/1 cards. Each player has several letters, and they seem to be mostly from the name plate, however there are known instances where the letters are from the team name on the front. The "PRx" numbers indicate the reported number of cards for each series of letters. Some players have multiple series (presumably from different jerseys - each card mentions the team in which the player was a member). When the actual letters are known, we have indicated that in the Note2 field, and removed the "PRx" from that series of letters. (The first player in this set that we did this with is Chris Iannetta.) Cards are not numbered.