Clip-In: this type of extensions has been designed to simplify the installation of extensions without damaging the hair. Our hair clip-in strips are 100% natural Remy Hair certified. Each product contains 2 lines of 3" - 8cm with 2 clips, 2 lines of 6.5" - 17cm with 3 clips, 2 lines of 4.5" - 11cm with 3 clips, 2 lines of 7.5" - 9cm with 4 clips, 2 lines of 9" - 23cm with 4 clips