Octane one nylon seatpostlight and short hard plasticnylon seatpost compatible with pivotal saddles lighter than any alloy post it is offered in two popular diameters 25 4mm for the spark most bmx frames and 27 2mm for the void and most mtb steel frames the 110mm length translates into to around 60mm of adjustment threads reinforced with alloy insert seatpost compatible with pivotal system seats diameters 25 4mm and 27 2mm material hard plasticnylon post length 110mm allowi