C7: 82mm x 113mm – fits an A7 card
C6: 114mm x 162mm – fits an A6 card
C5: 162mm x 229mm – fits an A5 card
116mm x 116mm: fits a 105mm x 105mm card
155mm x 155mm: fits a 148mm x 148mm card
133mm x 184mm: fits a 7″ x 5″ card
These are batched in packs of 10 or can be directly added to your card orders as an add-on.