Seating - Sentinel Armless Chair-Floor Mount, Gangable, Stone Gray : The Sentinel Armless Chair is designed to stand alone or be bolted together. The ergonomic design provides maximum comfort using rotational molding technology. Durable, one piece, rotationally molded design for increased strength. Constructed of high impact "no break" polyethylene. No steel or wood components. Can be bolted together or in place via concealed pilot holes. Can be easily filled with sand through ballast door and secures with tamper resistant screws. Sound dampening. Easy to clean, sanitize and maintain. Passes Flammability UL 94 HB. Tested to ISO 22196 showing a greater than 99% reduction in bacteria. Flame Retardant (passes Cal 133) Test reports available upon request. Manufactured to ISO Quality Standards in the USA.