Tourmaline for a Comfortable Environment Only natural gemstone tourmaline has a permanent electrode that provides various effects and actions. Size: M Color: Off-white (different from the image) Images 5-6 show the one I use (size M). I usually use it folded in half, but I'm using it unfolded. It's very stretchy. It stretched to about 45 cm wide. When folded, it's about 40 cm. No box. Thank you for looking! m(_ _)m