https://www.amazon.com/gp/product/B07NJRRQ5S/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1

This is the one is recently bought. I heard 0.5mm 192 needles is the recommended size for minoxidil beards, and this is the best one I found on Amazon. It has real 192 needles, while the others on AMazon supposedly use discs that don't work as well and dont penetrate deep enough. its pretty high quality and works well.