Supernatural,
I can't find on Storm's site, or anywhere. Hybrid?/Urethane.
As a pretty decent size thrower of total hook, I can say I throw on a shot very similar to this video and do fairly well with a Roto grip Sonic X solid.
Similar to the slightly stronger Roto Shout of today.
I also have a strongly drilled Storm Natural. It hooks, doesn't usually have much backend and is very sensitive to and creates carrydown. Great for smoothing out a wet dry in practice, great for 7 pins for this lefty, and great for picking up double wood.
I like it and still am waiting for a time it will outperform my reactives for strikes. Have many happy uses for mine but striking is not it's strongest suit!
Again, I have been told I create a lot of backend reaction. When I bowl in tournaments I am often as deep as just about any lefty I have personally bowled with(trying to reduce), and those Urethanes on the left just usually create a very rounded slow slurve for me!
REgards,
Luckylefty