The brand of hair berets that Penny first made in with Sheldon's help in "The Work Song Nanocluster" and has been seen wearing in "The Dead Hooker Juxtaposition" "The Countdown Reflection". After Sheldon delivers a box of sequins to Penny he helps he refine her manufacturing process. After Leonard makes a website for her, the whole gang has to over night to finish an order of one thousand when Leonard guarantees two day delivery. She is seen wearing them at Howardette's wedding.
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