First and foremost, inspired by: http://www.thingiverse.com/thing:15170 These holders are sized for the Arkham Horror Mythos and Item card sizes. They use a locking pin instead of a tab because I wanted these holders to fit inside my organizer box easier. Enjoy! Update 1/2/14: ah_mythos_card_holder_2 now uses the same size pin as the item_card_holder.Depending on your printer, there may be very light sanding needed on the inside edges of the lock tips. Use mythos holder 2 if you want all the holders to use the same size lock pin.