This is a Seria 6-hole binder. It comes with 9 sheets of 3-pocket refills. It's the perfect size for K-POP trading cards with Seria sleeves (as shown in the 4th photo). However, cards with sleeves won't fit in the middle pocket. The sleeves in the 5th photo will fit (available at Seria). The pockets are double-sided. Approximately 60 of the sleeves from the 4th photo will also be shipped with the binder. Please refrain from purchasing if you are overly concerned about minor imperfections.