You may wonder why we have plumbers tape in a sewing shop! It is used to seal the ends of metal and plastic boning after you've capped them with end caps - the tape keeps the caps extra safe and smooths any rough edges. You can also use the tape without end caps.
Marvellous stuff, you just stretch and stick. The tape sticks to itself as it stretches over itself. Like florists tape, but white.
This is 'gas' strength tape which means it's a bit thicker than the usual tape, you get a really blunt end to your bones if you use this.