80HD - These 80HDs are an exclusive 80 durometer high density speed urethane that cuts out unwanted wheel flex usually found in other soft wheels. These things are fast, soft and out of control.
Wheel Shape
Classic Full Shape - The Classic profile with an increased riding surface designed for speed and stability.
Durometer
80a - Versatile wheels meant for pushing, curb-slapping, mellow hill-bombing and sliding. These wheels roll smooth and steady.