Heavy duty, tan plastic already-made tubes (no assembly). Used one time. Paid $.90 per tube for the 24", $1 per tube for the 30". Am selling 24" for $.45/tube, 30" for $.50/tube. We've consistently found that grapes planted in these tan plastic grow tubes far-outgrow vines planted using the cardboard carton-style. I have photos showing vines planted in adjacent rows using the tan plastic and cardboard tubes and the difference is striking.