Assertion: box spring | /r/MadeOf | metal
Facets:
value: more often
type: DEGREE
Source sentences:
text: Box springs once had metal springs inside to absorb shock, but today's box springs are more often made from wood or metal and consist of a hard, sturdy box that sits under the mattress and supports it.
text: A box spring is made of either wood or metal and is designed to support innerspring mattresses.
text: Box springs once had metal springs inside to absorb shock, but today's box springs are more often made from wood or metal and consist of a hard, sturdy box that sits under the mattress and supports it.