Here’s the Head Microgel 125. I think it’s probably a few years old.
Weight: 125 grams (light)
Balance: 370mm (head-heavy)
Head size: 500cm2 (large)
Image via amazon.com
This must be that gel technology. Presumably the same one that’s in Dr. Scholls’ shoe inserts:
Rachael Grinham used to be gellin':
Image via SquashSite