Some are synthetic and some are made of human hair. The natural hair of Caucasians is different from that of Asians or Afro-Caribbeans and you should choose an extension that will match your own hair.
They come in many varieties and can be pre-colored, pre-highlighted or pre-permed with curls or a body wave. Depending on how it was attached, you may need to have your hair extension re-done after 6 or 8 weeks, or it might last up to 4 months. Re-attaching will always be periodically necessary because our natural hair continues to grow, the bonding agent becomes loose, life happens, and you’ll need to re-adjust and refresh your hair’s appearance.
