Model 308F has an 18" seat height suitable for older students.The sturdy fabric and polypropylene seats and backs fold so that chairs can be nested and/or stacked for greater space conservation.Durable scratchresistant gray metal steel frame.Builtin ganging brackets will ease setup and keep your rows in order.No assembly required.Stacks/nests up to 15 high.Weight capacity is 300 lbs.Greenguard Certified for Children and Schools.