Amazon.com: 3000 Pack Colorful Hole Punch Reinforcement Sticker Labels, Tear Resistant Plastic Circles Hole Protectors for Loose-Leaf Paper Sheets, 20 Donut Designs(Outer 0.5”, Inner 0.25”) : Tools & Home Improvement
Amazon.com : YOUOK Paper Hole Reinforcement Stickers Labels, Colorful Round Binder Page Labels for Repairing Holes and Strengthening Holes,Great for School, Home and Office.(1260 Pcs) : Office Products
Avery® Hole Reinforcement Label Rings
500ct Paper Hole Reinforcements Label Sticker Binder Ring - Etsy