Based on this product's specifications, here are some alternatives and similar models
Wrist Rest Fellowes Breyta Compact Keyboard (TKL) Silicone Sand 320×60×17.5 mm
Summary description:
Ergonomic wrist rest for compact TKL keyboards by Fellowes Breyta, made of silicone in sand colour. Certified to EN ISO 9241-5, it measures 320 mm wide, 60 mm deep and 17.5 mm high. Supplied as a single unit, the pad supports neutral wrist position during typing, reduces strain and improves comfort for office and home use.