Need a holder for your book? Why not let us rescue an almost thrown glass bottle & upcycled it for you? Our Eco-friendly book holder is kiln-formed in a furnace at 800 degree Celsius. All Tiger and Twig upcycled products are made from glass bottles that were destined to be in the landfill. Each piece & color might vary from each other depending on the waste material available. Let's make it cool to care with Tiger and Twig.