Installation Suggestion: If you want to try out the hair or add volume to your long hair wig, order 20-40pcs please. If you have short rough hair (shorter than shoulder length), order at least 60pcs-80pcs please. If you want long hair and volume, order 100pcs or more please. How to install Q: Can I straighten or curl the hair extensions? A: Of course, dear. It’s 100% Cuticle Human Hair, you can use the straightener or curling iron to re-style, but the temperature should NOT exceed 180℃, because excessive heat will damage the hair. Q: Can I Bleach or dye the hair extensions? A: Yes, after test, Natural Black color can be bleached to 27# and dyed to Jet Black. It's recommended that you consult a professional hairdresser for help or use 1pc for test first.(Do not use inferior hair dye.) Color customization Dark Colors: 02# 04# Light Colors: 60# 613# Ombre Colors: T1B-613# T1B-60# T1B-4-27#