It can take anywhere from 150-250 strands for a full head of hair depending on how thick your own hair is. you can use 50-100 strands to highlight your own hair . or make thin hair to thick . Hair Care please wash it by special shampoo, which is the most mild one, and clean water as well. Please use the shampoo recommended by local professional hairdresser. Improper wash or process probably make the hair dry, easy to fall down or tangle. How you care for your extension will be the ultimate determining factor. Please refer to local professional hairdresser for professional tip .The hair can last 2-5 months in proper way.