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they are like guidelines, because the mold is divided in "two" systems, the inner one with the silicone for the details and the outer one with fiberglass like a shell so it wont loose is shape =). so to keep the inner one on site it needs some ghuideline points, thats why the circular things are. think of it like the circular things on a LEGO piece. sorry my english is not very very good to explain that sort of things.