RaceFace Atlas I-Beam Seatpost The I Beam System uses a single easy access 5mm bolt for quick and simple adjustments or saddle changes Micro head design allows precise angle adjustment 2014 clamps and 6061 cold forged aluminum head 31.6x350mm Elliptically extruded and CNC machined from 2014 aluminum the seatpost head is incredibly strong and fatigue resistant Patented head design is lightweight and distributes loads more efficiently than conventional seatpost head designs Offers unprecedented adjustability with tilt adjustment completely independent from the fore aft adjustment The seatpost tube is elliptically extruded and CNC machined from 2014 aluminum for optimal strength to weight ratio The tube is anodized and turned with a fatigue optimized surface finish Graphics Garbonzo topo graphics