Wheels - 80mm/84mm 80A - This particular wheel format increases the rate of acceleration and improves manoeuverability over other designs. Cuff - Enhanced Stability - 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. 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.