Wheels - 84mm/80mm 80a - This particular wheel format increases the rate of acceleration and improves manoeuverability over other designs. Cuff -T:Nine Stability Cuff - The K2 T:Nine Alexis T:Nine Alexis has an added rear insert for maximum support. This is the most supportive cuff in the K2 line and great for any type of skating (specifically designed for womens feet). Frame - Hi-Lo Aluminium - This is what makes the alternate wheel sizes possible with the high back end and low front end. The alluminium / titanium design itself is assurance of quality for money. Bearings - ILQ-7 - Considered the bearings of the future they provide a better load rating, better durability, better free spin, and lower weight. This bearing is specifically designed for inline skating.