Bobby Pins: The Wavy SideWhy one side of the clip is crimped.
From the show
Why it looks like thatA standard bobby pin features one flat arm and one crinkled, wavy arm. This design isn't just aesthetic; it is a mechanical grip system. The wavy side is engineered to rest against the scalp, using the ridges to increase surface area and friction to hold hair in place, while the flat bar applies the clamping force to lock the style.
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