From the Manufacturer...
The Hydra is a Putt & Approach disc for short turning drives and approach shots. It is made with a grippy, durable plastic that floats in water. It is easy to release and has a friendly grip making it great putter as well. All Hydras are approximately 175 grams.
Weight Range: R-Pro: 173-175g
Best Choice for: Water hazard approaches, Straight shots, Bad weather putting
Available Plastics: R-Pro