they're 1" in diameter and 0.85" thick. i realize now that there's no way to tell the size from my picture, so i'll probably add another one with a quarter next to it for reference.
with sorbothane, the thicker you get the lower the resonant frequency and the better the damping, so long as compression is still betewen 10 and 20 percent. these are designed to be as thick as possible, while maximizing compression throughout. which means, basically, that this is the optimum design for components in the weight range.
according to the engineers at sorbothane, their material only works if you can see it "bulging" (i.e. it's in the target strain/compression range), and just looking at my footers with a load applied makes it clear that they're far superior to any kind of hemispheric design in that regard. again, this is another thing that i'll have pictures of and a more indepth discussion about on the website soon (including finite element simulations comparing avg. strain in my footers vs. a hemisphere design under a given load).
-gary