K2 Alexis Womens Fitness Inline Skates The unmatched comfort of the K2 Softboot NEW Stability Plus cuff that is lightweight, offering maximum support while remaining super lightweight and sculpted for speed and comfort Die Cast Aluminum frame: Medium length energy transferring frame is more efficient with the added stability of aluminum 84mm 80A wheels/Max size 90mm, ILQ7 Bearings for a great coupling of speed and smoothness