Each piece of Trefoil Stained Glass is handcrafted using a traditional copper foil stained glass technique commonly known as ‘Tiffany Glass’. Every individual glass element is hand-cut, wrapped in copper and soldered together. Stained glass, copper, lead-based solder and corrosive chemicals are used during the manufacture process. Stained glass can be heavy but fragile so care should be taken when deciding where to display your new glass art. Suction-backed sky hooks are not recommended for hanging. While some items may be intended for children, they should in no way be considered toys and are for ornamental purposes only. Not suitable for food use. Cleaning: To keep your new glass looking its best gently wipe over with a soft cloth. Do not submerge in water and avoid the use of abrasive chemicals as these may scratch the glass or cause damage to the patina.