Hmmm... it’s plastic, was hoping for resin. It is very light, smaller than hoped for, but I believe big enough to do the job. There is a hole in both legs and seat for the addition of a substance, like sand. I am wondering if adding concrete to the base would be appropriate to keep the item ‘in place’. I purchased to use as a functional bench for employees to use on their schedules breaks. Not quite sure this piece will be able to hold up to that kind of use.