NU LOCS are a very durable dreadlock crochet style. Available in 18, 24 and 36 inches. 18 inches has 21 strands, 24 inches has 20 strands and 36 inches has 21 strands. We recommend using  5 packs but you can use more or less depending on the fullness you want to achieve. They can be installed using the individual method and are reusable!!