Like micro links fusion is done strands by strand or by individual pieces. The pieces are bonded to your natural hair using a hot tool that fuses hair and keratin together. Our fusion hair extensions at Hair Extensions New York City is done using a compound that mimic the one we have naturally in our hair. Thus is not damaging as regular glue is. The hair can be wash and style as usual, it last 4 to 6 months ( with proper maintenance)