ARSD 44:12:01:19. Tube construction -- Sterilization required

Each reusable tube, including the grips on the tube, must be either stainless steel, nickel-plated carbon steel, or Lexan. The grips may also be constructed of anodized aluminum. Lead-bearing solder may not be used in the construction of the tube. Each tube must be thoroughly cleaned and sterilized between patrons.