Natural virgin hair bulk Hair without a weft is called hair Bulk. Bulk hair is loose. Human hair bulk is simply single strands of human hair that is bond or tied at the root end of the hair supply. For human hair bulk, we can supply raw human hair and processed human hair in all colors, length and style with high quality. International markets more poplar bulk hair specification is as follows: Hair type:100% Remy hair or Human hair Hair length :8-30inch (completed hair length )