Features Excellent Material - Using premium plastic material with transparent color, not easy to deform, highly resistant to corrosion and long time use. FOR YOUR PAPER - Designed to have 30 holes, the A4 spiral binding spool makes it easier to turn pages for easier reading and writing. Better Binding: Simple manual opening and closing, you can also remove the spool to adjust it to the preferred length for paper storage. LARGE CAPACITY - Able to cut a large amount of sheets up to 100 pieces, the binding back is suitable for office, classroom, library, etc. 10 Pieces in Total There are 10 pieces spiral binding spools in the set, and the large quantity will simplify replacing damaged spools. Specification: Item type: spiral binding. Product material: ABS Product colour: transparent. Package list: 10 x spiral binding spool. Package List 10 x Spiral Binding Coil