An optical fiber attenuation sensor that includes a first protrusion movable between a first position and a second position, a second protrusion movable between a third position to a fourth position, and an elastic object coupled to the first protrusion that causes the first protrusion to move from the first position to the second position. Parts of the tape are formed by high pressure plastic film forming. A plurality of magnets are in the hollow collar, the magnets being insertable through the open end face.