More efficient organization for alphabetical, chronological, or numerical sorting. Durable black leather combines with gold numbering for a classic and elegant look. The prepunched holes are reinforced with copper for dividers that stay securely bound in your three-ring binder without tearing on the rings. With these durable dividers, your paperwork is organized every day. Index Divider Style: Monthly; Index Divider Size: 11 x 8.5; Punched/Unpunched: 3-Hole Punched; For Use With: Ring Binders.