The material is a strong canvas, and they are good sized. My kids are really rough on things and these seen to be holding up well. One small are (4 inches) where a seem is starting to fray after a week. The only downside, and why it doesn't get 5 stars is the hanging hardware. It comes with a masonry bolt with a sleeve. Not got for hanging in a ceiling joist. I had to go get other eye bolts.