The Vivexotic Heat Mat Holder, ensure heating melamine Vivariums has never been safer & more convenient. The glass heat mat holder has been specifically designed to enable heat mats to be used safely in wooden Vivariums. It incorporates twin layers of glass so that air can circulate across the surface of the mat to reduce the risk of overheating & thermal blocking. Creates even heat distribution Eliminates hot spots Protects heat mat from animal & water damage Sturdy construction with BS safety glass For best ?t & results, use with Exo Terra Medium heat mat (26.5 x 28cm) Mat not supplied