what is single drawn hair and double drawn hair?

Just like our own hair,single drawn hair is thicker at the root and gradually become thinner at the tip.Single drawn hair extensions contain multiple lengths of hair.

To obtain a double drawn hair bundle,The shorter hair will be took out by hand.Double drawn hair means the thickness of hair strands remains almost the same from root to tip rather than becoming thinner at the ends.

Here below is the photo shows the difference between single drawn hair and double drawn hair.