The 16" Fine Line Clip In Volumizer by hairdo is a one piece volumizing extension created by Ken Paves and inspired by Jessica Simpson. This volume-boosting extension instantly transforms thin, medium length hair. Affordable, lightweight, and easy to apply, these virtually undetectable extensions can be put in and taken out in a matter of seconds. It"s like you - only better! Base Dimension: 10" x 3" SPECIAL FEATURES Fine Line Technology - The hair is sewn onto a thin, ultra-Invisible polyurethane base which creates a lighter, thinner, undetectable application and lays flat to the head for a more comfortable, natural-looking effect. Heat-Friendly - Made with Tru2Life synthetic hair you can curl or straighten using heated appliances - up to 350 degrees. Pressure Sensitive Clip - Clips on without causing damage to your own hair and fits comfortably and securely in place.