The Mission Carrier Stealth Pivotal Combo includes a Mission Stealth Pivotal seat as well as a Mission Stealth Pivotal post. The seat is a perfect size. Not too big but just right for those of you looking to do barspins. The included post is 25.4" in diameter and comes in 170mm length. This is a great deal for price and is the perfect set up for those of you wanting to upgrade from your bike's stock set up or just save a few bucks on your custom bike.