【Dual Specification Fit】Offers 4 slot and 5 slot core specifications with precise intervals for different card sizes . 4 slot design has approx 9cm(3.54 inch) width per slot for large capacity sorting . 5 slot design has approx 6.8cm width per slot for high density storage . Fully covers MTG , sports cards , idol cards and other collectible needs 【Portable & Standard Size】4 slot : 37.5x34x11cm(14.76×13.39×4.33 inches) . 5 slot : 38x35.5x11cm(14.96×13.98×4.33 inches) . Meets international storage standards , lightweight and stackable for desktop or cabinet use 【Corrugated Core Protection】Adopts high strength three layer corrugated cardboard with hollow buffer structure . Effectively disperses pressure and impact , avoids bending , creasing or scratching , providing professional protection for high value collections 【Precise Compartment Design】Built in integrated fixed dividers for clear classification . Quick sorting by series , rarity or deck . Easy access and neat organization , doubling efficiency for personal collection or inventory management 【Foldable Space Saving】Folds for compact storage , unfolds to stable structure with no deformation . Reusable , and economical , ideal for long term collection and commercial stock