I found a slip yoke made by Speedmaster for 1350 U-joints for a great price but would like to know which material they are made of. All descriptions I can find just say "billet CNC" - not if chromoly or regular steel. Price used to be around $116 but Speedmaster has a promo going on with a 50% discount - so currently the yoke is for sale at only $58! https://speedmaster79.com/Chrysler-...-Yoke-1350-U-Joint-30-Spline?quantity=23

Any idea what it is made of?