From Rocket:

Steelhead-100 Broadheads: 100 Grains, 1 1/8" cutting diameter, with three 0.027" thick blades. The ferrule of the Steelhead-100 is machined in one piece together with a stubby version of the Pathfinder point. Use with any bow at any speed.

Steelhead-125 Broadheads: 125 Grains, 1 1/4" cutting diameter, with three 0.027" thick blades. Togh as nails, the Steelhead-125 is just possibly the toughest 125-grain head made. It has the full sized Pathfinder tip. Use with any bow.