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 in sizes 15mm, 20mm, 28mm, and 40mm, and colors include pink, red, yellow, green, blue, and multicolor. Keep your loose leaf items organized and easily accessible with these practical binder rings. Features: 1. Made of high-quality plastic, flexible, with high toughness, not easy to break, and durable for long-term use. 2. Practical tool to help organize loose leaves. Suitable for binding and storage of cards, loose-leaf books, and similar items. 3. Inner diameter options: 15mm, 20mm, 28mm, 40mm. Double buckle design provides added strength, easy to fasten and secure. 4. Ideal for use with loose-leaf books, notebooks, scrapbooking, key rings, and other loose-leaf materials. 5. Package includes: 50 x Loose Leaf Rings. Color options: pink, red, yellow, green, blue, multicolor. Specifications: Material: Plastic Color: Pink, Red, Yellow, Green, Blue, Multicolor Size: Inner Diameter: 15mm, 20mm, 28mm, 40mm Weight: 25g, 37g, 64g, 125g (varies by size) Package Included: 50 x DIY Binder Ring