These dummies have trucks that are made from either Marble Wood or Tiger Marble wood. Marble Wood comes from the cold mountains of northern Japan or Taiwan, not the South American or African species of Ebony by the same name. The wood has a twisting nature which evolved to help it survive in severe climate conditions and abrupt changes in temperature, and it is this which gives the wood the marbling effect. This wood is very dense "like marble". It requires the most care to prevent cracking, but can also be the most beautiful. Tiger Marble Wood is more dense and heavy than the regular marble. It gets its name from the striping effect sometimes apparent in the grain.