Staples 3 Inch BetterView Binder with D-Rings (Teal) 3-inch D-rings offer smooth page turning Holds up to 600 sheets of letter-size paper One-touch mechanism opens with a finger touch Staples Better view binder with 3-inch D-rings boasts a durable, flexible spine that is reinforced with rubber to prevent damage and splitting D-ring design has a straight side that makes it simple to add or remove pages and a curved side for easy page turning