<|im_start|>user
What material is typically used for rowing shells?

Context:
Originally made from wood, shells are now almost always made from a composite material (usually a double skin of carbon-fiber reinforced plastic with a sandwich of honeycomb material) for strength and weight advantages. World Rowing rules specify minimum weights for each class of boat so that no individual team will gain a great advantage from the use of expensive materials or technology.<|im_end|>
<|im_start|>assistant
Rowing shells are now typically made from carbon-fiber.<|im_end|>
