Frequently referred to as the ABT Braking System. This allows the trailing skater to expend less energy. An instrument used to measure and provide a hardness rating for polyurethane, which is the primary wheel material. The higher the rating, the harder the wheel, with 74A being the lowest and 101A being the highest. Most recreational skates fall in the 78A-82A range.
Skates have three edges inside, outside and center.
Protective equipment worn around the elbow and secured with a wide elastic band or Velcro strap. A hard plastic shell supplies further protection. Also called the chassis. Many skates have oval-shaped frame spacers for 180 flips and the ability to rocker the skates. Also called artistic skating.