Ultimate Guard Premium Comic Dividers Card Sleeves (25 Piece), Black New, optimized size (183 x 280 mm) for better visibility of the tabs and still perfectly sized to fit inside all standard-sized comic boxes Newly shaped, two-sided index tab: write-on index tab on both sides with new shape and extra space for stickers Rigid polypropylene: the high quality and rigid material keeps your dividers durable and strong, even after many uses Fits fully into comic boxes: sized to be used with all standard-sized comic storage boxes. Fits inside the box, even when the lid is closed Acid free  no PVC: this product is completely free of PVC and acidic materials and therefore ideal for protecting Comics