Pre-bonded Itip human hair extensions also called micro ring or cold fusion, are in a class of their own. Their higher cost and time investment have their own rewards, which is why these extensions have their own committed fan club! Available for installation by a salon professional they will attach individual I-tip strands similar looking to a shoe lace with metal micro rings. We sell 25x strands per pack. We suggest a minimum of 4 packs (100 strands) for a full head, however you may need more depending on how much hair you have and how much volume and body you require.