Same question here. There are so many pencil erasers available...

What about the width of a pencil? that is about 5 mm diameter... still a load of hair.

And, in addition: Will every hairsample be assigned to a colour code that will be used by the factory then, or is an individual hair sample always more accurate than a colour code? I mean, once I've sent a good hair sample and I'm happy with the colour of the resulting piece, can I get the "number" of that colour and put it in each future order?