a plastic base and use a stainless steel bolt to lock them into place

and one that's comfortable to boot

Quality materials

Size: 248x140mm

With lightweight fabrics and a quality removable chamois

Enduro CH 699 9mm x 20mm x 6mm Bearing - 9mm - 20mm - 6mm - Ceramic ABEC-5 Radial Bearing - C3 PDP|PLP|Rail Material a plastic base and useCH 699 LLB Ceramic Hybrid, ABEC 5 Radial Bearing (C3 clearance) 9 x 10 x 6mm This ABEC 5, Ceramic hybrid bearing features deep groove design 52100 high Carbon Chromium alloy races, with grade 5 Silicon Nitride Ceramic balls, dual lip labyrinth (LLB) seals to withstand the outside elements, and to contain the 90% fill Kluber NBU52 ultra smooth and sticky, water proof grease. Si3N4 ceramic balls reduce bearing wear and increase bearing life by