Shotshell Tray that hold 50 each. They are perfect for storing reloads and convenient in the duck blind. Built durable and are stackable. They make for a good space saver in your reloading area. They are the trays that fit into the SD-100, AC50C and many other MTM cases. They also fit in the discontinued S-100 and SF-100's. They are not designed for the SH-100 and SF100D, but will fit in there.