BMX seat post (but can be used with any bike that takes a 26.8mm post).
* Color: SILVER ANODIZED
* Material: Aluminum alloy
* Size: 26.8mm
* Length: 350mm (just shy of 14") - minimum insertion 3 3/4" from the bottom so about 10" of effective maximum length
Tapers at the top to 7/8" so it can be used with standard size seat guts on railed seats.