Sheets of baseball card holders and a notebook. Each sheet holds 9 slabs. They are more flexible than the hard plastic sheets, but if you are not rough, they work well. The cheap ones don't work well, but I found some higher quality ones (I think they had some sort of endorsement or hologram from Major League Baseball) at Target and they work great. Here is an example of those sheets: http://shop.mlb.com/product/index.jsp?productId=2488426&cp=1895815.1902052.1759322