Prodigy Discs says this about the H2: The H2 is an over stable hybrid disc with a little less stability and more glide than the H1.
About 400 Series Plastic
The 400 series is a premium blend of material that is extremely durable. The unique blend of plastics feels as good as it looks and will be able to be broken in over time. This tour quality plastic gives the thrower better grip even when it is wet.