As above, fine people, what would the best feet be for a slate isolation platform?

Current wooden slab has rubber feet that I'm easily persuaded to move to the slate, but I'm wondering if there's another, more efficient/audio-enhancing solution.

By the way, the slate isolation platform was a snip at £43 - made to measure and finished nicely by the a slate specialist in Snowdonia in under 24 hours. Identical jobbies on eBay and elsewhere normally command at least twice that price, so shout me if you want the name of the company.