7 1/2 x 1 1/2 x 10 1/8 Plastic 1.5 inch Mini Binders, 3 Ring Binder (Pack of 1)
JAM Paper Plastic 1.5 in Binders, 3 Metal Rings, Pink, 1 per Pack - Walmart.com
Source Multi-pocket PP Plastic Ring Binder Folder Spiral Refillable Clear Display Books on m.alibaba.com
Plastic Ring Binder | Binding Supplies
JAM, Plastic 1 Inch Binders, 3 Ring Binders, Red, Blue, Green and Orange, 4 Per Pack - Walmart.com
50pcs Binder Ring Loose-leaf Binder Ring Plastic Ring Puncher Ring Buckle Ring Removable Binding Notebook Binder Plastic Ring - Binding Combs & Spines - AliExpress