TLS Book Cards have superior strength and a smooth hardened finish. 125 lb. medium weight index stock. Exellent holding surface to prevent "feathering"; resists wear, fraying and tearing. Cards are 5"H x 3"W and printed in blue ink on both sides. Made from 27% recycled index card stock. Blank Header allows room for circulation labels; two column grid offers space for a Date and Issued To information.