Hair wraps can be worn for up two weeks and can be washed along with your own hair (use light soap) and towel dried.
P.s. If you like this project you may want to check out instructable "Unique and easy temporary yarn falls".
Step 1: What you need
-Of course hair, I recommend no less then four inches
You don't need very much to make these. The most important part is how much embroidery floss you'll need. Unfortunately there is no right answer. It depends on how much hair your wrapping, how tight you wrap it, and how long the hair is. Here is some guidelines to help. Never use floss shorter then the length of the hair times three. Use on strand of floss per color. The less colors you use the more string you need, so if you wrap only has two colors in it you may want four times the length of the hair. If you do happen to run out of string I will tell you what to do later in the instructable.
Any type of small rubber band will work but the clear tangle-free type don't last as long as the traditional ones actually made from rubber.