Harmony Magnetic Glass Colors Square Corner Markerboards 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.