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.