Wand core

The core of a wand is a magical substance placed within the length of wood. They are usually bits of hair/feather extracted from some sort of Magical Being or Creature. The materials used for wand cores can vary widely, though certain wand-makers may prefer to use certain materials; for example, Garrick Ollivander discovered and pioneered the use of phoenix feathers, dragon heartstrings, and unicorn tail hairs, whereas his father used lesser substances such as Kelpie hair and Kneazle whisker.

The wand always chooses the wizard or witch and not the other way around. This is a question that many who study wands called wandlore cannot understand or explain. It would seem that wands have in some sense of the word—a mind of its own. The Wand will never surrender itself to another easily either; which is something many in wandlore understands to some extent.

Price
All wands cost seven galleons, regardless of core or wood. Unicorn tail hair, however, is worth ten galleons a hair, as confirmed by Horace Slughorn in 1996. The reason for the drop in price when the hair is used in a wand is unknown, but the hair might be cut slightly to fit into the wand, thus decreasing its value.

Behind the scenes

 * The Enchanted Feather Company is a company that presumably sells wand cores to wandmakers.
 * It is thought by some that Thestral hair makes for a unique personality; completely dispassionate about its allegiance and showing no emotion towards the wizard, tying in with the many changes of hands that the Elder Wand (the only known Thestral hair wand in existence) has been through. It is also a wand that has been the instrument of death many times over, which some also believe is connected to its Thestral hair core (possibly inspiring murder in the heart of its beholder(s), since Thestrals have a strong connection to death, as does the origin of the wand itself). However, the many changes of allegiance that the Elder wand has had as well as its history of winning through murder may be simply a reflection on the nature of power itself, and the means people are willing to sink to in order to attain it.
 * It should be noted that, concerning the wands of the Trio (Harry, Ron and Hermione), each wand has one of the three different cores used by Ollivander: Harry's wand has a phoenix feather, Ron's wands (both his first and second) have a unicorn hair and Hermione's wands (both hers and Bellatrix's) have a dragon heartstring.

Appearances

 * Harry Potter and the Philosopher's Stone
 * Harry Potter and the Deathly Hallows
 * Harry Potter and the Deathly Hallows: Part 1
 * Harry Potter and the Deathly Hallows: Part 2
 * The Wizarding World of Harry Potter