So this is my first time getting a sew in with the http://www.perfectlocks.com extensions and this is my honest opinion. My hair was put in using the invisible part sew in method with absolutely no glue, I am a huge advocate for healthy hair!! You can purchase this product on this page http://www.perfectlocks.com/hair-weave-extensions/machine-wefts/wavy-machine-weft-natural. Just look at the virsitility with this hair, it's naturally straight, but with a little styling and care you can achieve any hairstyle you wish!