The Rainskates Stinger wheels evolved from riders wanting a harder, faster version of the Yellow formula. The Original batch of Stingers were a Lime Green/100a Durometer wheel came out in the 59mm, and 62mm sizes. In the pursuit of even better performance, we then switched over to a newer, flat-spot resistant, "Formula X" urethane. It is slightly harder than the Yellow formula, yet just as smooth with even better speed, and 95% of the grip. "The ultimate in Speed & Confidence".?
Here you have the overview About RAINSKATES wheels:
Magenta/82a: Smooth & forgiving.
Orange/85a: Smooth & responsive.
Lime Green/92a: Faster & firmer.
Green/95a: Excellent grip on slick & rougher surfaces.
Yellow/98a: Fast & controlled.
White/100a: Faster yet, but not too slick.
Black/101a Superthane: The Ultimate.