3-RING BOOK RINGS - 3-ring combination design is more conducive to the fixation of paper, each loose leaf ring can be opened and closed independently HIGH QUALITY - The ring is made of heavy duty steel and having nickel plating on the surface which will not crack, rust or split easily, secure and durable. APPLY TO - Loose Leaf Binder DIY Photo Album, Rings Book, Calendar, DIY Travel Diary, arrangement Thesis page, Binding Combs Colour:Black Material:Metal Size::10.01x2.49x0.03 cm Package Contents: 10 * Binder Ring Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.