<br>Cotoss Victorian Handcrafted tiffany style table light lampshade is slight heavy than you expected, as it is made of real stained glass. <br> <br>But when you knock it, it sounds like plastic. That's why? <br> <br>Because of its special manufacturing process. <br> <br>Each glass piece is cut by hand, then polish the edge before wrapping the copper foil. <br>The edges of the glass pieces are wrapped with adhesive copper tape (copper foil). <br>Then putted together in a mould according to the pattern. <br>At last, using soldering material to weld each glass at a very high temperature. <br> <br>The Stained glass is Much Heavy than Plastic, and couldn't been burned, normal knife couldn't cut them. Easy to Check it.