The Beast is constructed entirely of long-leaf southern yellow pine, the most common material used for wood coasters. It's just that the structure has been given a redwood stain.
Racer at Kings Island is built mostly of another wood...I believe it is Western fir, but I am not certain (I learned this about three years ago, so my memory isn't great)...which is seldom used in large quantities in wood coasters anymore because it's expensive and hard to get compared to the yellow pine. As the coaster ages, most of the maintenance lumber is yellow pine.
--Dave Althoff, Jr