S.P. Richards Company Slant Ring View Binder, 4" Capacity, 11 x 8-1/2 Inches, Black (SPR62472) Slant-D Ring Binder features thick vinyl and double-polished, wrinkle-free overlays that resist toner transfer Quality no-gap rings close securely and resist separation For durability and resilience, the cover material and overlay are made of polypropylene