YoungSee ltip hair extensions is made of 100% remy human hair,unlike synthetic hair, it retains the hair cuticle,blend naturally with your own hairIt's application of cold fusion makes it popular among people who prefer no heat on hair(high temperature heating may damage hair somehow).It won’t damage your natural hair or scalp due to we use a special keratin protein during manufacturing. Details of YoungSee Hair Extensiosn I Tip Human Hair Specification Material: remy human hairLength: 14-24inchWeight: 14-16inch: 0.5/s 100strands;18-24inch: 1g/s,50standsI Tip Size: 1cm long x 0.2cm diameterUse of micro ring beads: 5mm x 3mm x 3mm How to Apply I Tip Hair Extensions Insert micro ring into the pulling needle.Thread a portion of hair into the pull needle.