The comfortable Swell skates are made of high quality materials: ABEC9 bearings, 100mm Undercover wheels made in the USA and PS Trinity frames. Trinity is a brand new asymmetric system. The shoe is mounted on the frame by a three-point attachment. Both front screws are located on both sides of the frame. Swell Skates are designed especially for fitness skating and fitness training. Frame: Composite fiber shell Chassis: Trinity 3x110mm Wheels: Undercover 110mm 86A Bearings: WCD ABEC 7 FS