- Comioke binding combs made of high-quality plastic for increased durability - Suitable for A4 documents and compatible with 21-ring binding machines - Includes 80 combs in sizes of 12, 14, 16, and 18 mm, suitable for binding between 80 and 140 sheets - Provide a professional and flexible finish to presentations, reports, and books - Allow opening and closing to add or remove pages as needed - Durable material that does not break, scratch, or fade with use - Black color, ideal for office, school, or personal projects