The trunks or twisted wire, coded with a heavy amount of paint. As you can see it creates a very convincing look.

This close up shows the foliage. It is very well applied, not to clumped up and not too spaced out. It seems to be anchored fairly well to the branches. This foam club material is different from the stuff I found on the individual branches that also come in a set and can be used as trees. So you can

These are high-quality enough to work as foreground trees in small scale’s, but inexpensive enough to also work as background trees!