Wheel size: 80 mm; Cuff Support - Stability Plus cuff; Skate Frame - Stamped aluminum frame; Skate Bearings - ABEC 5; The K2 Speed Lacing System makes it easy to get in and out of your skates; Just one pull of the lace, roll, and stow and you're ready to skate - that easy; Stability Plus Cuff: Perfect blend of support where you need it while reducing overall skate weight; The Original SoftBoot: In 1993, K2 Skates introduced the world's first SoftBoot inline skate - forever changing the way performance skates are designed and built; K2 Skates Original SoftBoot technology has led the market, providing the highest performance level of comfort