100% unprocessed virgin hair, on 4x4 lace. Hair and knots can be bleached or dyed. Please be advised that closures are not meant to last as long as the virgin bundles, due to the fact that the hair is on lace and not a weft. Knots/hair strands will come out of lace if tugged or pulled vigorously. But they can last with proper care and maintenance by a professional.