This marker length Mini magnetic marker tray is a perfect way to keep your markers where you use them, on the surface of your magnetic receptive dry erase boards Our 5" satin anodized aluminum marker tray is the width of a standard dry erase marker. enough room to hold your markers without all the unneeded extra tray space and best of all you can more or remove the tray whenever you want. A .060 thick magnet covers the entire back and holds securely to any magnetic receptive surface. Works well on any steel magnetic receptive surface including, porcelain steel dry erase boards, refrigerators, filing cabinets etc. This is a great accessory for boards that don't come with a marker tray!