It came in at 22lbs on my bathroom scale and who knows how accurate that is. It is a Fisik tundra2 saddle which is really comfortable. It came with my cannondale scalpel3 so I decided to get one for my IP-057. Here is a breakdown of my build:
Medium 12X142 IP-057, 90mm stem, 680mm flat bar, seat post from Bert at Iplay.
Carbon wheelset from Yoeleo.com which included Circus Monkey lefty hub and rear Novatec hub.
Sram XO trail brakes
XX1 32t BB30 cranks
Sram pg1070 chain, 11-36 cassette.
Sram XO type 2 rear derailleur and XO shifters
Ergon Grips
Tubless Schwalbe racing ralphs EVO snakeskin (heavier but better sidewalls) with stan's sealer