Cardinal EcoSmart Ring Reference Binder with Locking Poly Rings, 2 Inch Capacity, Letter Size, Black Cover with Blue Spine (24022) Molded with 90 percent recycled polypropylene that's 100 percent recyclable (both ring and cover) Guaranteed 5 years not to crack or break Heavy-weight construction with durable living hinge is cold-crack tested to 10 degrees Fahrenheit One touch trigger opens ring to 2 positions: halfway for easy page viewing, and completely for loading Ergonomic grip on the spine for easy shelf removal