Human hair extension is a hairstyle technology recently introduced from Europe. As the name suggests, hair extension is to connect the hair to one's real hair, and instantly change from short hair to long hair. The hair used for hair extensions can be wigs or real hair. There are two types of hair extension mechanism wigs and handmade wigs. The materials used are chemical fiber silk and human hair. The fibers are mainly PVC and PET materials. http://www.angelfantastic.com/human-hair-extension/