Penny sleeves or other clear sleeves for double sided cards? Take care of your precious cardboard by double sleeving with Perfect Fit inner sleeves. Available in both standard size and Japanese size. Remember to put the inner sleeve on the card upside down, Sorin Sleeves Mtg Etsy If you care about your cards, you should probably be double sleeving. Yes, even the ones you don't play that much. Those clean Pokmon sleeves? Protected. Your favorite pulls? Safe. Your decks?