Zuma Series Lab Stools, ZUMA bridges the gap with seating that offers ergonomic support, playful style and durable construction – all at an affordable price. Tubular steel frame, one-piece molded polypropylene shell. Self-returning swivel seat rotates approximately 180 degrees. Optional configurations include a flame retardant additive. The flame retardant additive has been tested and meet the acceptance criteria of California TB-133. Compliance with 527 CMR, section 29 requires regulated seating (including molded seating)