Assertion: surfer's board | /r/MadeOf | plywood
Facets:
value: such as balsa
type: OTHER
value: such as mahogany
type: OTHER
Source sentences:
text: In the 1920s boards made of plywood or planking called Hollowboards came into use.
text: Made of solid wood (such as balsa or mahogany), these boards weighed up to 90 kilograms (almost 200 pounds).