Item Details *12 inches = 30cm, 30G *14 inches = 35cm, 30G *16 inches = 40cm, 50G *18 inches = 45cm, 50G *20 inches = 50cm, 50G *22 inches = 55cm,50G Application suggestion: * Short hair, want long & volume effect--80 pieces please * Long thinner hair, want more volume effect, 40-60 pieces please * Testing hair or want highlight effect, 10-20 pieces pelase Why is the color of the hair I received different from the pictures on the website? This is normal, because everyone's monitors are different, so we will see different colors. If you can't confirm the hair color you need, please provide me with your hair in the sun and indoors. Color, I will give you suggestions or provide you with pictures or videos you need. 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 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.