Amazon.com : Filexec 3 Ring Binder, 1 Inch Capacity, Opaque, Letter size, Pack of 4, Blue, Hot Pink, Purple, Green (50162-6497) : Office Binders : Office Products
Mini Durable 3 Ring Binders, 1”, Round Rings, 5-1/2” x 8-1/2”, 175-Sheet Capacity, Black, 2 Pack (13456) | Avery.com
Amazon.com: Pack of 5 Range Wholesale A4 Slim Ring Binders Assorted - 15mm Spine Folder File,Ideal for School, Office or Home use : Office Products
B5 Smart Ring Binder Notebook | Campus Binder Notebook A5 | Campus Ring Notebook - 1 - Aliexpress
Bindewerk | Ring Binder SUZETTE (slim)
Exacompta Opaque Flexi Cover Ring Binder A4 PK 20 Assorted
School Smart Folder Tabs for 3-Ring Binders, Assorted Colors, Pack of 5 - Walmart.com