This 6 foot rectangular picnic table has fiberglass top and seat planks. The in-ground center post is made of 6" galvanized square tube. The heavy-duty seat arms are made of 3 1/2" pipe. The seat and top supports are made of 2 3/8" pipe. This tamper resistant picnic table has 1/2" round head carriage bolts that hide the nuts. Fiberglass picnic tables are easy to clean and maintain. They are ideal for schools as they are vandal resistant, low maintenance, and have a stable writing surface for homework.