Hangabouts Metal Plates are powder coated and have a double sided permanent adhesive, allowing them to be fixed to plaster, timber and concrete ceilings. This allows for our magnets to hold and suspend your light weight posters, balloons etc. There are two holes that allow you to screw into the ceiling for extra holding capacity, we recommend wall dog screws. We have two standard sizes, round and rectangle with two standard colors, white and monument satin. We can coat any color but there could be an additional cost. Sold in bags of 10.