Based on this product's specifications, here are some alternatives and similar models
Ring binder slip-in cover A4 Barbara 0820001BN white cardboard 250 g/m², 50 pcs
Summary description:
A4 ring binder slip-in cover by Barbara (model 0820001BN) in white, made from 250 g/m² cardboard. Supplied in a pack of 50 pieces with a fastening strip for securing documents. Designed for A4 papers, it protects and organizes sheets for office, school or home use and is suitable for filing, storage and presentation.