Features:Core: X6 – 2 Layer Spoked CoreDiameter: 110mmDurometer: 86AWidth: 24mmEagle Performance Bearings IncludedPrice is Per WheelMaterial:Certified 6061 Aluminium ExtrusionPolyurethaneOur new Hard Line aluminium X6 2-layer core wheel. Made out of Certified 6061 aluminium extrusion and machined to shape. Hand poured in Holland. Urethane according to our own developed formulas. The 2-Layer (Dual Layer) design with this “undersized” X6 core is one of our UNIQUE designs and inventions that we started end last century! The advantage of the Dual Layer is that the wheels will get MORE rebound, MORE grip and MORE smoothness in riding.