Vivid color: you will get 400 pieces binding discs in bright colors, meet your multiple needs and help you do document classification; At the same time, bright colors can attract children's or students' attention and make them happy to DIY their own projects Durable material: these discbound expansion discs are made of quality plastic, lightweight, safe, non-toxic and not easy to break, easy to store, apply or carry out for a business trip, the surface is smooth to ensure that the page does not get stuck when turning Practical to use: plastic binding rings can be arranged flexibly, easy and convenient to to add, remove and replace notebook pages, without damaging the paper, very suitable for students, office workers, travelers, designer, etc. Easy to apply: suitable for arrange your papers, documents, notebook pages, paintings, keep them organized and look more neat and clear Widely application: these plastic book binding discs can be applied for A7, A6, A5, A4, B5 papers of various sizes, and suitable for loose-leaf, memo filing, scrapbook, great for fastening pretty document stack, index, curriculum cards, notebook, papers and keys, make them organized and not messy, great for office and home Color: white+yellow+blue+pink+purple material: plastic Package Contents: 400 Pieces Plastic Book Rings