* Holds up to 10,800 cards: Each box holds approximately 675 standard size trading cards with no sleeve (total 10,800 cards) or 565 cards with Invested Alliance Penny Sleeves (total 9,040 cards). * High quality: Our white corrugated paper is thick and sturdy to securely store your sports card collection box. Our boxes are built perfectly for bulk card storage. Card houses are stackable. * For standard size collectors cards: Our storage boxes protect your standard 2.5” x 3.5” (63.5mm x 88.9mm)trading, gaming and sports cards. Use with our Invested Alliance soft penny sleeves for the ultimate card protection! Card boxes do not fit toploaders. * Easy assembly: Visit website for instructions on bottom of housing unit. (1 housing unit, 6 dividers & 16 storage boxes) * Interior dimensions of card storage boxes: 12.25” x 3.75” x 2.75” | The external dimensions of the Card House once built are: L = 18.5", W = 12.75", H = 14.25"