FSA is taking the plunge into the realm of the dropper post. No idea on the internals of this new stelath post from them other than an air spring for the return and a bar mounted remote lever. Typical sizes: 30.9 and 31.8 diameters, 100 and 125 lengths. Reported weight is 738 grams, so evidently the fat lady has now sung on the dropper post opera--this is one of the heaviest posts currently on offer, although the FSA peeps are clever and will likely cut that weight down on the next rendition. Ballpark this one in at around $300 USD, according to FSA people setting up their booth.