Features:Large size 63mm spec, more clearance off ground for handlebar folded.Narrow width to minimize heel strike issue (10mm)Aluminum CNC machined, unique pattern design.Stainless duo bearings with titanium bolts only 72g/pairM6 bolts compatible with most x-rollerWidth: 11mmWeight: 72g/pairMaterial: Aluminium Alloy Al6061Country of manufacture: Taiwan