SCP-3660 is a black metal zipper, similar to those found on sweaters and backpacks. The item is in poor condition. A significant amount of its paint has been ground off, the metal is warped and half of its slider is missing. SCP-3660 is non-anomalous and inert until it is pressed against the skin of a human being. In a manner not dissimilar to magnetic attraction, SCP-3660 will gravitate into the subject if held lightly against their skin.