It's like the pull-string of chain stitching on flour bags -- you pull the string and the 'extra' comes off leaving you a string of baby balls that you can simply tack onto your piece without having to sew it into a seam! This requires less planning! You can make your little cushion and THEN add the trim -- not having to fight with attaching it during the finishing. Beautiful colors. Presented in continuous 2-yard lengths.