Spring loaded, vinyl clad and aluminum rounded corners. Back thumb notch for easy entry. Ribbed front cover eliminates paper adhering. Three tension springs on 9" x 12" size. Stainless steel I.D. holder 1/2 labels. Rod ends are rubber covered. Interchangeable with most racks. 3/4" capacity holds up to 150 sheets.- Clear Anodized Aluminum Chartholder Mfr. Direct