Single-subject, spiral-bound notebooks are made of 100 percent post-consumer material, giving new life to old paper. Process Chlorine Free (PCF) eliminates harmful chlorine emissions. Acid-free, archival-quality paper preserves documents and prevents yellowing over time. Each 17 lb. sheet is college-ruled with no margin and no perforation. Environmentally responsible, soy-based ink is used for rulings. Covers and wires are made from recycled materials.