Materials:
Yarnart Jeans (✓2, yarn density 50g/160m/174yds), color:
dark gray
white
black
1 mm crochet hook
2 mm crochet hook
Glue
Metal hair clip (hairpin), 5 cm (2 in)

Product Sizing:
Finished size: 7,5 cm (3 in)

You can use any other yarn, but keep in mind that this will affect the size of the finished product.