Not sure, more like aluminum both sides plus insulation between.
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It seems standard here. My current one has it, too.
-A-mao-
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02/19/2013 postreply
20:19:52
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I put insulation on door myself
-美西游子-
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02/19/2013 postreply
20:41:21
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我也猜他们是想忽悠给你这个门呢 :)
-不周山-
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02/19/2013 postreply
20:16:42
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You are in tx, we are much cold in winter.
-A-mao-
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02/19/2013 postreply
20:21:43
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we are much hotter in summer,
-不周山-
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02/19/2013 postreply
20:44:33