Take your ideas with you Symmetry Portable Glass Marker Boards utilize a European design and are engineered to be light weight, easy to move, and durable. The boards are made from 1/4-inch safety glass and are available in clear (write on both sides), frosted (write on one side), and sandwiched whiteboard (write on both sides). Symmetry glass marker boards can be used in conference rooms, training and meeting rooms, private offices, and at workstations as a portable privacy p