All our Mosaic Bases are made from MDF - NOT suitable for the exterior. However the difference with our boards is they are laser cut, this gives them their unique burnt edging which stops moisture setting in, we strongly recommend sealing both sides of your project and also the sides before mosaic work is done. A mix of 50/50 PVA and water is suitable. Please ensure these are placed away from water, rain, etc.
Please note no hangi9ing hardware is included, a simple D-Ring can be used to hang these, make sure you use the correct size screw for your thickness of board eg: 6mm or 9mm screw depending on the thickness of your base.