One Touch™ mechanism lets you open, close and lock your binder in one easy step. Gap Free™ feature prevents ring misalignment so pages turn smoothly. Crystal clear overlay enhances custom inserts on front cover, back cover and spine. Nonstick, archival-safe material won't lift ink or toner off of printed pages. Locking EZD™ ring holds up to 50% more than same size round rings (20% more than slant rings). Back-mounted rings allow pages to lie flat. Four inside pockets store unbound materials for improved organization. PVC-free. Capacity Range [Max]: 3"; Sheet Capacity: 670; Color(s): Gray.