Perhaps, single drawn hair is the most popular type of hair extensions. Normally, a standard bundle of the single drawn hair contains about 50% full-length hair and 50% other length hair. But it is not necessary for you to worry about the hair quality since it is the same as of other standards. The only different thing here is single drawn hair contains a bit more short hair strands.
However, the single drawn hair is definitely cheaper than double drawn hair. Generally, if you know right how to trim it, it can be thickened as the same general appearance of the double drawn hair.