Hand-cut circles made from coloured mirror in 25mm diameter. The thickness is 3mm and combines easily with all standard stained glass and mirror. The silvering of the mirror contains no mercury and is safe to use in closed spaces. Although the back is sealed with epoxy paint, it is advised that a neutral glue (not cement or mortar) is used such as PVA or Adhere. As these are individually cut and shaped, there will be variations in size and form.