The frame is no longer assembled from laser-etched wood, instead there's a powder-coated steel frame with PVCplastic sides to help shield the various moving parts and lend an air of professionalism to the affair.
Phthalates, the chemicals that make a PVC container flexible, "can migrate out of the plastic when it's heated, " says Dr. Halden, who has done comprehensive studies on emerging contaminants and plastics for more than a decade.