Flash Furniture HERCULES Series 661 lb. Capacity Navy Ergonomic Shell Stack Chair with Black Frame and 16'' Seat Height Stacks up to 15 Chairs High Ergonomically Contoured Design Vented Back allows air circulation Seat Drain Holes assist in drying Double Support Rails Protective Plastic Floor Glides Limited Lifetime Warranty on Frame Designed for Commercial Use Recommended for 3rd - 7th Grade Students Easy to Clean