actually, they are just 3 pieces of plastic that are cut to fit. there is a tiny gap around the edge of the knob. you gotta kinda bend the plastic piece very slightly to get the edge of the plastic to go under the edge on the knob. if that makes sense. the only problem with the ac ones i have so far, is that there isn't any adhesive or anything on them. so they turn with the knob when you move the knob. i probably will have to remove them and put my own adhesive so they stay in place.
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