Based on this product's specifications, here are some alternatives and similar models
Abrasive sanding belt Scheppach for BTS800 K120 914 x 100 mm, set of 3 (SCH88000212)
Summary description:
Replacement abrasive sanding belts for Scheppach belt sander BTS800. Each belt measures 914 x 100 mm with K120 grit, supplied as a set of three (MPN SCH88000212). Designed for wood and soft metal sanding, deburring and surface preparation on compatible belt sanders. Use for smoothing, shaping edges and removing material in workshop or DIY projects.