Stdrums in the mean time started coating metric heads, I heard that one can get Remo Renaissance in metric size from Altenburg Pergament in Germany, apparently Musikhaus Westharz, from whom STdrums bought the metric head technology, sometimes made under-the-counter metric heads from sized-down Remo inch heads , maybe Stdrums does, too. I was lucky to acquire some old metric calf heads for my drums.