Features:Big 70mm-diameter easywheels for larger ground clearance. 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 ezwheels rollerThey can be used on C-Line or P-Line Brompton bikes with rear racks.Diameter: 70mmWidth: 11mmWeight: 72g per pairMaterial: Aluminium Alloy Al6061Country of manufacture: Taiwan