According to Lane Masters, it is supposed to be a highly polished solid, as was the Big-R-Bang. Both, however, look like pearls. Maybe they're solid/pearl combinations, but Lanemasters has never mentioned making such a ball.
Oddly, when the Terminator Rebellion was released in April, Galen Gentry of Lane Masters told Joe Cerrar of Bowlers' Journal that it was "their first solid resin, two piece ball since the Extreme Impact of 2002". So I'm not sure what's going on and who's telling what story to whom.
I'm operating under the assumption that WCR is a solid.
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"None are so blind as those who will not see." Unofficial Ballreviews.com FAQ