These 50pcs binding rings are made of high-quality plastic, durable and flexible. The double buckle design allows for easy and secure binding and storage of loose leaf books, cards, and other items. Available sizes are 15/20/28/40mm and colors include pink, red, yellow, green, blue, and multicolor. Keep your loose leaf items organized and easily accessible with these practical and useful binder rings. Features: 1. Made of high-quality plastic, flexible, high toughness, not easy to be broken, durable to use. 2. Practical and useful tools can make your loose leaves organized. Suitable for binding and storage of cards, loose-leaf books, etc. 3. Size: Inner Diameter: 15mm, 20mm, 28mm, 40mm optional. Double buckle design is stronger, easy to buckle and not easy to loose. 4. Used for the loose-leaf books, key rings, notebooks, scrapbooking, or other loose-leaf items. 5. Package included: 50 x Loose Leaf Rings. Color: Pink, Red, Yellow, Green, Blue, Multicolor optional. Specification: Material: Plastic Color: Pink, Red, Yellow, Green, Blue, Multicolor Product Size: Inner Diameter: 15mm, 20mm, 28mm, 40mm Product Weight: 25g, 37g, 64g, 125g Package Included: 50 x DIY Binder Ring