Round spine, Firenze Astro style binder in Paolo Cardelli Signature Binders
Amazon.com : Yoobi 1 1/2 Inch Binder Set – 3-Ring Binders with 2 Pockets – Perfect for School or Office – Holds up to 375 Sheets – 4 Pack – Solid Multicolor Variety : Office Products
BAZIC 3 Ring Binder 1" Poly Binders Matte Color Soft Cover, 175 Sheets, 48-Count - Walmart.com