Material: Human HairLength :12/14/16/18/20inch (30/35/40/45/50cm)Net Weight:12inch=70g14inch=75g16/18inch=95g20inch=110gPackage includes: Human hair extension*1Wire in hairpieces naturally blends into your own hair,people won't know you are wearing extensions because wire will be invisible.With the aid of the adjustable transparent wire, it can fit any head shape or size perfectly.Unlike the traditional clip in hair extensions,it's lighter and really easier to apply and remove without any extra help in a few minutes.Due to the difference in light and display,there may be some color difference between pictures and real products. HOW TO APPLY THE HAIR EXTENSIONS :1.Slip the Wire in synthetic hair over your head and position band around the top of your head like a headband.2.Pull the side of your hair out in front of the hair band to blend in with your natural hair.3. Finishing the look, release all the hair and blend in with hair extensions.