Harmony magnetic glass colors square corner marker boards are eco-friendly - 100% recyclable and made from recycled glass, Sand and steel. Unframed boards feature 1" square corners, square standoffs and flat polished edges. Tempered glass, ¼” thick, provides a non-porous surface that will not ghost or Stain and works with standard dry erase markers. The rear face is painted for a vivid contrast and is available in a choice of colors. A steel sheet backing provides a tackable surface with the use of rare earth magnets. Four or six pre-drilled mounting holes are inset into the glass and 1” square satin aluminum standoff hangers create a 1¼” spacing between the wall and glass. The board features 4 rare earth magnets, 4 markers, an eraser and clear acrylic rear-mounted accessory holder. Made in the USA.