Why are Boymia Hair Invisible Clip Ins more Invisible? 1. From the Clips side, For the Seamless Clip ins, the thread used to sew the clip is visible. But for Invisible clip ins, the thread is hided into the hair. 2. Different from seamless clip in weft, it is thinner and softer. So it fits the scalp better and is more invisible. Weight Design: 12inch 30cm 100G 16inch 40cm 100G 18inch 45cm 120G 20inch 50cm 120G 22inch 55cm 120G 24inch 60cm 120G Weight statement: Above is the product total weight, including hair and clips. Clips weight are about 23.5g. Totally Weight Error Range is +/-5g.Please know this before placing order. Can This Hair Be Straightened, Curled? Yes, the hair is real human hair so it can be straightened or curled, but please don't do it too frequently if you want hair with a longer lifetime. If you restyle it each day, the lifetime may be 4-8 weeks and hair ends will be very dry. Why Is The Lifespan Only 3 Months In The Description? According to the frequency of people's hair growth, ladies usually go to the barbershop to fix their hair once every 3 months. 1. The hair material is naturally black, so for getting different hair colors, the factory painted the hair. So, the hair is damaged once already and we called "Machine Remy hair" or "Nonremy hair" in the description. 2. If the buyer doesn't always heat hair, just let hair keep the original state and always add nutrition on hair, the hair can be used for 5 months (according to the experience of our real clients). 3. If the buyer always restyle hair, and changes color, also don't notice the hair care, the hair will only be used 4-8 weeks. How to Identify Human Hair and Synthetic Hair? --Firstly, get ready for a lighter and a little strand of hair ( At least 10 hairs）. --Then, burning the end of the hair for 3 Seconds. How to Identify Human Hair and Synthetic Hair? --Firstly, get ready for a lighter and a little strand of hair ( At least 10 hairs）. --Then, burning the end of the hair for 3 Seconds. ********Human Hair******** ---Burns very quickly, and it smells like a burst fragranced. ---When the lighter is moved away, the fire will be extinguished immediately. ---After burning, it is easy to turn to be ashes. ********Synthetic Hair******** ---Smells like burning plastic, very pungent, and there is black smoke when it is burning. ---When the lighter is moved away, the hair will continue to burn for several seconds. ---After burning, it turns some small lumps. Why the real hair color looks different from the description? Monitor Reason: Because the colors on the Monitors of different mobile phones and computers are different, we will use the displays of Apple mobile phones and computers as the standard, and try to show the pictures of the products as true as possible. But even so, we cannot guarantee that the color of your hair after receipt will be exactly the same as when you purchased it.