The Zero1 is an excellent seatpost with twin-bolt screw adjustment, the same system of Zero2 model. The Zero1 seatpost along with stem and handlebar is a great finishing kit for any road bike. The seatpost is made of 6061 aluminium and guarantees lightness and strength at a very competitive price. Available in two diameters 27.2 mm and 31.6 mm and BOB (Black on Black) finish.