These Discbound Expansion Discs are made of plastic material and are for use. Binders are suitable for many purposes, such as loose-leaf, memo filing, etc. They are simple in design, but very practical to use and will give you a good experience. Features -Color:Sky-blue -Material:Plastic -Size:2.80X2.80X0.20cm/1.10X1.10X0.08in -Binder Discs are made of plastic material, and practical for use. -The loose-leaf Discbound Discs are meticulously made, and the color is not easy to peel off. -Round plate appearance, much beautiful and practical, very suitable for home, office, etc. -Lightweight and portable, they are very convenient for you to carry and store. And you can also share with your friends. -You can use these Discbound Expansion Discs to bind of loose-leaf paper quickly. Package list: 30 x Binding Rings