Based on this product's specifications, here are some alternatives and similar models
Leitz 12730000 Blank Tab Index Made of Cardboard and Polypropylene Grey
Summary description:
Leitz 12730000 blank tab index designed for efficient document organization and filing. Crafted from durable cardboard and polypropylene materials in a grey color, this indexing accessory helps categorize paperwork in binders and folders for office, school, or home use.