Veela hair

Veela hair was a material from the head of a Veela that could be used to comprise the core of a wand.^[1]

Known Wands

Fleur Delacour, a part-Veela witch herself, owned a veela hair wand. The hair for her wand was donated by her grandmother. The wand is 9½ inches long, made of rosewood, and described by Garrick Ollivander as "inflexible".^[1]

In Slavic mythology, some legends claim that if even one of a Veela's hairs is plucked, she will either die or be forced to change into a non-human shape.
It is possible that Gabrielle Delacour, sister of Fleur, also owns a Veela hair wand, since it is probable that her grandmother was willing to donate another hair for Gabrielle just as she did for Fleur.
It is possible that Apolline Delacour, mother of Fleur and Gabrielle, also possesses a Veela hair wand since it is likely that her mother was willing to donate a hair for her as well.
Since Britain's chief wandmaker, Garrick Ollivander, finds that Veela hair cores make for "temperamental" wands, it is likely that there are few Veela hair wands made in Britain. Since the only known Veela hair wand is from France, it is likely that there is a wandmaker from central Europe, possibly Gregorovitch, who uses Veela hairs as the cores in his wands.
Due to the possibility of their grandmother donating another hair, it is highly possible that Fleur and Gabrielle's wands could trigger Priori Incantatem if they ever found themselves locked in magical combat.

↑ ^1.0 ^1.1 Harry Potter and the Goblet of Fire, Chapter 18 (The Weighing of the Wands)