Based on this product's specifications, here are some alternatives and similar models
Double massage ball Springos ACT0097 — EPP foam, 16×8 cm, medium hard (50° Shore A), max user 100 kg
Summary description:
Double massage ball Springos ACT0097 is made of lightweight EPP foam (33 g) with medium hardness (50° Shore A). Measuring 16 cm long and 8 cm in diameter, it supports users up to 100 kg and is designed for myofascial release, trigger point therapy and muscle relaxation. Available in black and blue with Actiget® logo, suitable for physiotherapy, sports recovery and home use.