Thick, comfortable foam. They make a very stable impression and were quite easy to assemble. The instructions are just a blurry diagram - if it were a higher resolution it would be easier to interpret, but it works. I really want them to work, but my Jetstream rods have a large gap between the fitting and the rods, and the bolts aren't long enough to fit a washer, bolt, and toggle switch in my setup. Pity!
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