"Ollivander makes the finest wands," Professor McGonagall explained. "He uses woods of different types and lengths, and there is a magical core inside each one. Your wand should be specially chosen to match your nature. They are handcrafted by Garrick Ollivander himself, the latest in a line of wandmakers dating back to Roman times. Your new wand will channel your magic and serve you better than any homemade creation could possibly manage."