Based on this product's specifications, here are some alternatives and similar models
Potting Soil for Bonsai COMPO 5 L — specialized substrate for bonsai cultivation
Summary description:
COMPO Potting Soil for Bonsai is a ready-to-use 5 L substrate formulated for bonsai cultivation. This specialized potting mix provides an appropriate balance of drainage and water retention for bonsai trees, supporting root health and stable growth. Use for repotting, root development and regular container care of indoor and outdoor bonsai specimens.