 Since each centrosome has a K fiber connecting to each pair of chromosomes, the chromosomes become tethered in the middle of the mitotic spindle by the K fibers.K fibers have a much longer half life than interpolar microtubules, at between 4 and 8 minutes.During the end of mitoses, the microtubules forming each K fiber begin to disassociate, thus shorting the K fibers.