They are built and look to be made of sturdy pine. So the build is solid and the bags are made well but stuffed quite full so you get more of a bounce than other bean bags. The wood is untreated which probably adds to the bounce effect for it cannot slide on untreated wood. My 1st picture shows the underside which is still as untreated as the surface was, however, I felt they needed some attention. We applied a light stain to bring out the color of the pattern out and then an epoxy resin to seal it and also allow for a bit less surface friction. The 2nd picture shows the now glossy surface like what you might see on a wood treated bar. They are better now but I would have hoped for some kind of surface treatment to begin with so this wasn't necessary.

Family loves this - they are light enough to move around but heavy enough that the don’t move while playing

They look nice, but my husband said the plywood is not thick enough to be regulation and thus affect play. So if you are concerned about having regulation boards, these won't do.

I love the retro design. Word to the wise, I left the bean bags in the sun for a few days and they got sun bleached.

Very nice set. Would recommend to anyone.