1.These are perfect for dancers who need to feel reassured while on stage. <br> 2.The wonderful thing about these is that they are reusable.<br> 3.These will fit average size hair buns. <br> 4.Hold the two buckles, then straightened, the length of measurement is about 50cm(Flat diameter is approximately 6.26inches)<br> <b>Note: </b>They will work with the Little Donuts, but not the Big Donuts once the hair is wrapped around. <br> <b>Package:</b>15pcs Invisible hairnets