CE Approved. According to ISO/DIS 12216. EE, EO & ER type are supplied to Area III, IV. Designs for craft type "any".316 stainless steel machined stamped frames. ports and hinges. Hand Polished and electro polished to provide long lasting protection against corrosion.Wing type nylon closures.Weather resistant themo-plastic NEOPRENE gasket.Clear or Tanned Acrylic.