Can be used independently. It is recommended to use it with the card/card pack protective box launched by "Kawashima Productions" TCG Full Protect Sleeve S Size (set of 3 pieces) TCG Full Protect Sleeve R Size (set of 3 pieces) TCG Full Protect Sleeve W Size (set-3 pieces) TCG Full Protect Packcase Unopened card package special protective box S Size (set-2 pieces) TCG Full Protect Packcase Unopened card package special protective box L Size (set-2 pieces)