20" Russian Flat Weft 100% human hair. 50 grams of DOUBLE DRAWN hair is crammed into a 30cm width weft which allows the row to fit very flat and discreet in the natural hair. This means no folding the weft over like traditional bulky wefts. Lasting upto 12 months - depending on how its treated by the individual. To be sewn in by a professional (weave) or to be used as clip ins. 2-3 bundles needed for full head depending on length and thickness of natural hair. Can be coloured darker to match your natural hair - I'd reccomend a professional doing this for you! Do Not use any bleach - the hair has already been through a gentle process to get to the colour it is when you recieve it.