You choose which size of needle head you need, 

1-2 can pick up to 1-2 strands of hair. 

2-3 can pick up to 2-3 strands of hair, 

3-4 can pick up to 3-4 strands of hair, the needles look pretty same to me! but they are in categories.


Consider this item too 

Lace for making or Ventilating Lace Wig Base
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