For SM-JBOX-IG-S and SM-JBOX-IG-L:
These boxes are made of durable PVC/PPO thermoplastic for corrosion resistance. The color of these boxes is ANSI 61 gray color.
For SM-JBOX-WM-L:
This junction box is made of seam welded 16 ga. stainless steel with a smooth gray external finish with a clear zinc plate on the interior.