The Hurricane 9 is quite different from the other Hurricane rubbers because each color has a different unique sponge and therefore unique characteristics. The Hurricane 9 Blue, sponge code 22#, offers more power. Hardness 39The Hurricane 9 is quite different from the other Hurricane rubbers because each color has a different unique sponge and therefore unique characteristics. The Hurricane 9 Blue, sponge code 22#, offers more power. Hardness 39