Ample Storage Capacity: Featuring 3-inch rings, these binders can hold up to 400 pages. Designed for simplicity and efficiency, they have no inside pockets, providing a streamlined, clutter-free organization. Exceptional Durability: Crafted for long-lasting use, Carstens Heavy Duty 3-Ring Binders feature precision no-gap rings tested for 50,000 opens and closes, ensuring reliable performance and long-lasting durability perfect for professionals and students alike. Premium Plastic Construction: Made from high-quality, durable BPA/BPF/BPS free polypropylene, these waterproof binders resist bending, folding, scratching and tearing (even in the creases). They're stronger than standard vinyl binders and the hospital-grade smooth surface makes them easy to clean. American-Made Excellence: Proudly manufactured in the USA of US and imported parts, these binders support local craftsmanship and guarantee superior quality control, reflecting the best of American manufacturing. Woman-Owned Business: Carstens is a certified WBENC woman-owned business dedicated to producing high-quality office supplies, empowering women entrepreneurs and supporting diversity in the workplace. Carstens Heavy Duty Ring Binders are made from premium Copolymer Polypropylene plastic to resist tearing and bending in even the most demanding work environments. The No-Gap steel rings are tested for over 50,000 uses right in our manufacturing facility to ensure they hold tight and stay aligned. The 3-inch ring models hold up to 400 sheets, 2-inch models hold 300, 1.5-inch models hold 250, and the 1-inch models hold 125. Our waterproof binder surface is impenetrable to air and liquids, ensuring easy cleaning and maintenance – ideal for rigorous use in busy environments. Whether it’s for medical charting, healthcare facilities, offices, schools, or homes, Carstens Heavy Duty Ring Binders are built tough to get the job done. For over 130 years, Carstens has been the choice of the pros, setting the standard for quality and durability in products for healthcare facilities and beyond. We’re proudly made in the USA of US and imported parts, and a WBENC certified Woman-Owned Small Business.