Ring Binder Donau 4-ring A4 40 mm green – 4-ring A4 binder, 40 mm spine

Donau 4-ring A4 binder with a 40 mm spine in green is a practical filing solution for punched A4 documents. The binder is designed to accommodate standard four-ring punched pages and holds approximately 300–350 sheets depending on paper weight. A durable cover and a conventional ring mechanism provide stable storage and straightforward access to inserted documents, making it suitable for office, school and home organisation of reports, manuals and projects.

Advantages

The binder offers a robust construction with a 40 mm spine that provides substantial capacity while remaining compact on a shelf. Its four-ring mechanism ensures pages lie flat and remain securely in place, and the green finish helps with visual categorisation. The durable outer cover resists everyday wear, and the standard A4 format guarantees compatibility with common punched documents and dividers.

Suitable for

• Organising office documents, reports and meeting materials
• Storing school notes, assignments and study materials
• Compiling manuals, project documentation and reference sheets
• Home filing of invoices, warranties and household records

Key specifications

• Format: A4 (suitable for A4 punched pages)
• Ring type: four-ring mechanism for even page alignment
• Spine width: 40 mm capacity (approximately 300–350 sheets depending on paper weight)
• Cover: durable rigid cover for regular use
• Colour: green for easy identification

How to use

Open the rings using the lever or manual press mechanism, insert pre-punched A4 pages onto the rings and close the mechanism until it clicks to secure pages. Use dividers or punched pockets to separate sections or protect loose sheets. Store the binder upright on a shelf or horizontally in a drawer to prevent deformation; avoid overfilling beyond the nominal capacity to maintain ring alignment and cover integrity.

Usage recommendations

For long-term organisation, use reinforced punched sheets or plastic pockets for frequently handled documents. Label the spine to speed up retrieval and group related documents by colour or tabbed dividers. Keep the binder away from excessive moisture and direct sunlight to preserve cover and paper quality.