Industry leading design, construction and sustainability. 0.25 in. tempered glass. Dry erase surface with ultra white back. Maximizes visibility, clarity and ease of erasing and cleaning. Frameless board design. Easily and securely mounts to the wall using four architectural blocks. Serves dual function as marker and eraser storage. Downward pointing marker retention. Blocks in black finish. Made in USA. Small: 48 in. W x 36 in. H (29 lbs.). Large: 60 in. W x 36 in. H (36 lbs.) The Clarity series exemplifies cutting edge design and function. As today"s work environments strive for great productivity, tools that improve visual communication and organization are more essential than ever. The Iceberg Collaboration Boards are a breakthrough in design, function and durability. They allow you to create, display, organize and share important information when and where it"s needed.