As the name suggests, these letterbox boxes are specifically designed for hassle-free delivery through letterboxes. They are officially approved by Post NL, ensuring compatibility with all standard letterboxes. These sturdy letterbox boxes are ideal for delivering small, lightweight products effortlessly through letterboxes. Thanks to their 1.2 mm corrugated thickness, these boxes maintain their shape and offer enhanced protection for your products throughout the PostNL distribution process. Product Specifications: * Easy to Store * Size: 299 x 213 x 28 mm * Quantity: Pack of 50 boxes * Format: A4 * 100% Recycled * Fits Through Letterboxes * Available in Multiple Sizes * Discreet Shipping in Protective Packaging In summary, Power Escorts Recycled Letterbox Boxes A4 299 x 213 x 28 mm - Pack of 50, approved by Post NL, are specifically designed for easy delivery through letterboxes.