These frames are of lightweight acrylic glass and have the advantages that they are more child safe than real glass hence also reduces the risk of breaking the glass during transport. They are manufactured in EU and by the use of sustainable wood production. When cleaning the acrylic glass, we recommend you use a soft cloth like microfiber dampened with clean water. We don't recommend the use of detergents. -High Quality Closing system. -Solid wood. -Anti-reflective Acrylic glass.