Also called Braid pins, these have 5 ridges or waves on them and they are supposed to be used upside down with the wavy/ridge side toward your scalp. This gives more grip on your hair and prevents breakage of hair also.

Hairstyling Tip: When using wavy pins, use them upside down for MAXIMUM HOLD

Mini American style Braidpins
5 cm Braidpins
Big Braidpins 6.5 cm