Use these top-loading, dual-purpose, unpunched Sheet Protectors to protect both your letter-size insert pages & letter-size tabbed index pages. First slip each insert page & tabbed index page into its sheet protector. Then punch three holes, or however many holes your binder requires, through both sheet protector & insert page or tabbed index page. This keeps each firmly in its place. Sheet protectors are made of durable, 3.15 mil thick, nonglare, nonstick polypropylene that won't lift print. Each features sealed seams at binding edges & die-cut corners on ring side that let pages turn freely. Best of all, each sheet protector can be used with tabbed indexes without obstructing view of tabs.