Carstens Heavy Duty Ring Binders are manufactured with premium polypropylene plastic to handle the high demands of medical facilities, schools, offices, warehouses and more. They’re resistant to bending, folding, scratching and tearing (even in the creases) – substantially stronger than standard vinyl binders – to last for years and save money over time. These ring binders are the professional-grade standard for hardworking people and places across the country. 
1-inch rings (125 sheet capacity), 1.5-inch rings (250 sheet capacity), 2-inch rings (300 sheet capacity), 3-inch rings (400 sheet capacity), 4-inch rings (600 sheet capacity)
Precision engineered No-Gap Rings tested for 50,000 uses to hold tight and stay aligned
Extra-long front and back panels fully cover and protect standard divider tabs
Smooth areas on spine and covers allow labeling that sticks and stays
BPA/BPF/BPS free – proudly made in the USA of US and imported parts
3-year limited warranty on rings and covers