Based on this product's specifications, here are some alternatives and similar models
Balance Sensory Half‑Ball Massage and Exercise Tool Lean 16 cm Orange
Summary description:
Lean sensory half‑ball (16 cm) is a balance and massage tool designed for proprioception, stability training and rehabilitation. The textured, hemispherical surface provides sensory stimulation while the flat base enables steady placement for exercises, core strengthening, ankle and foot work, physiotherapy and balance practice at home or in studio.