Well constructed and works/feels great. Exact fit of a PSA slab with sleeve, in width and height. Card Saver I's also fit these perfectly in width, without sleeves. They are a few mm short of fitting with the sleeves, and are about 1/4" shorter than the box height. The lids slide off without needing to hold the bottom box. Just be careful to grab it from the bottom when picking it up. I ordered several and they are perfect.