a disposable , cord dispensing cartridge comprised of a rigid , shatterproof plastic housing including first and second housing sections having inner and outer surfaces which are ultrasonically secured to each other . the housing includes an internal cord - holding cavity of cylindrical shape dimensioned to receive a spool having two circular flange portions connected by a stem portion . the spool is dimensioned to retain a predetermined length of high strength , small diameter cord which is machine - wound in dense - packed fashion thereon .