Amazon.com : Lever Arch 2-Ring Binder; U.S. Letter Size; for 2 3/4" (7 cm) Center-to-Center (cc) Paper Punches (Not for A4 Documents with 8 cm cc Spacing) (1 Assembled Binder, Black) : Office Products
Advantage Classic 2-Ring Binder with Slipcase, 2" Spine - Bindertek
14" 2-Ring Top Binder Black Poly - Item: #14-140
Muji Ring Binder 2 Ring PP Clear No Color A5 / B5 / A4 - Etsy