Review (3/5): Messy Packaging, difficult to use.
The string is saturated in charcoal liquid, excessively. There aren't any directions, so I didn't realize I needed to take the string out of the tiny ziploc. The case was difficult to open. The string and dispenser were challenging to use. I am generally good at this type of thing (painting my nails/make-up/crafts that demand a steady hand) and I found it extremely cumbersome.