Premade fans are made of a synthetic material called PBT. PBT (or Polybutylene Terephthalate) is a type of polyester used in a range of products including toothbrushes, sports and swim wear, and—of course—false lashes. Most "mink" or "silk" lashes in the market are also actually made of PBT. They are just labelled as Mink or Silk to distinguish the difference in appearance such as tapering at the end, texture and finish. Our premade fans are made of Korean PBT which is the highest quality material to create a full, defined volume look while offering a very natural, lightweight finish.