Same size as a cable. The pieces are too short and there are no connectors every 16 inches to cover/stabilize the joints (I overlooked that they aren't longer) or lighten the corners. Initially, double-sided foam tape is either of very poor quality or very old. In any case, I had to waste a few pieces of duct and tape that wouldn't peel/peel off without leaving bits of tape not tacky enough for assembly. disappointment in general.
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