An element is configured to be installed together with a tape to form a fastener stringer, and includes: a main body including an upper main body and a lower main body; an installing portion for installing the tape; a head; and a neck connecting the main body and the head, wherein at least one of the upper main body and the lower main body includes a convex portion and a base portion, the convex portion protrudes from the base portion and extends in the left-right direction at an intermediate position in the front-rear direction. An inclined portion inclined downward along the left-right direction is formed on at least one side of the head along the upper-lower direction, and protrusions extending in the front-rear direction are formed on both sides of the convex portion.

An element is configured to be installed together with a tape to form a fastener stringer, and includes: a main body including an upper main body and a lower main body; an installing portion for installing the tape; a head; and a neck connecting the main body and the head, wherein at least one of the upper main body and the lower main body includes a convex portion and a base portion, the convex portion protrudes from the base portion and extends in the left-right direction at an intermediate position in the front-rear direction. An inclined portion inclined downward along the left-right direction is formed on at least one side of the head along the upper-lower direction, and protrusions extending in the front-rear direction are formed on both sides of the convex portion.

A headset cord holder comprises a body and a first groove built into the body configured to receive and releasably hold a headset cord. In some embodiments, the first groove has a diameter less than or equal to approximately 2 mm. In further embodiments, the body is integrally formed within the teeth of a zipper. In some embodiments the body comprises one or more of rubber, plastic and metal. In some embodiments, the body comprises one or more of stamped metal and molded metal. In further embodiments, the body comprises molded plastic. In some embodiments, the body comprises one or more additional grooves configured to receive and releasably secure the headset cord.

A headset cord holder comprises a body and a first groove built into the body configured to receive and releasably hold a headset cord. In some embodiments, the first groove has a diameter less than or equal to approximately 2 mm. In further embodiments, the body is integrally formed within the teeth of a zipper. In some embodiments the body comprises one or more of rubber, plastic and metal. In some embodiments, the body comprises one or more of stamped metal and molded metal. In further embodiments, the body comprises molded plastic. In some embodiments, the body comprises one or more additional grooves configured to receive and releasably secure the headset cord.