Unlike sewing needles, these needles are specially made to make the eye of the needle as close to the width of the entire needle as possible. The size of a needle is similar to the way the beads are sized; the higher the number the thinner the needle. A good way to determine what size needle you will need is to use one size smaller than the size of the beads you’re using. For example, you should use a number 12 needle with 11/0 seed beads.