The medium 12" record dividers are made from the same 30-point, black, high-density, archival quality polyethylene plastic as our other record dividers, but feature a 1 ½" tall, full-width header. Dividers can be positioned with the header on top when the records are in a record boxes, crates, or bins, or the dividers can be turned with the header on the side to help organize vinyl records on shelves. These work great in open Album Storage boxes and crates to show off and separate your LPs by band or genre and are easily visible above the tops of your albums.