The Healthy Wave Amethyst, Tourmaline, Obsidian, Jade Far Infrared Queen sized Mat combines key Mat technologies and several types of crystal into one single mat. This mat features optimal PEMF technology at 7-8hz and up to 3000 milligauss dynamic field strength, 36 low level 660nm therapy red lights and is made of 67% crushed amethyst crystal, 11% tourmaline crystal, 11% jade crystal and 11% obsidian crystal. This mat with the smaller crushed stone pieces will conform to your body shape better when you lie on it and provides better comfort. Due to the PEMF being included in the mat it cannot be bent in any direction and can only be used on flat surfaces. It can be folded in 3 sections for easy storage or transported in its carrying case.