Our new hard line aluminum x6 2 layer core wheel made out of certified 6061 aluminum extrusion and machined to shape hand poured in holland urethane according to our own developed formulasalso back is our unique 2 layer system often copied but never equalled what will give the user more rebound and more grip115mm x6 spokecertified 6061 aluminum extrusionwidth 24mmprice is per wheel