The Crew Arm Chair is designed to stand alone or can be bolted down to group 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. Bolt to floor with optional bolt down kit. 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.