Vectra Strong Invisible Thread & Online Instructions by Steve FearsonSteve Fearson's Vectra Line is the strongest invisible thread ever offered to the magic community. A single strand can hold nearly a quarter pound! That's a full deck of playing cards! Now, for the first time you can safely levitate large items like CDs, coat hangers, scissors, you name it. Vectra Line is as invisible as some of the thinnest threads on the market but is stronger than all of them. Q. Is Vectra Line stronger than Kevlar or Spectra