12" tray to attach to bottom of a white board to hold markers. Good quality aluminum. Had a lip/edge to fit on the bottom grove of the white board, but a tad small to attach to mine. Unlike the description, this was not glass, and do not consider it magnetic. It has a cheap magnet attached to the inside of the tray. I was expecting magnets on the back to attach it to the board. This magnet cannot be removed, nor would it be strong enough to hold the tray with markers. This is my sole reason for the low stars.I'll be gluing real magnets on to the tray rather than returning.