The Easton aluminum HITs are 16 grains. Iron Will makes a 25 grain hardened steel HIT. We also make a 15 grain titanium HIT and 10 grain Titanium Impact collar for 25 grains total.
https://www.ironwilloutfitters.com/reinforced-hit-system/
https://www.ironwilloutfitters.com/reinforced-hit-system/