Fir with Dragon core, 12 and 3/4 inches, reasonably supple.
Fir: My august grandfather, Gerbold Octavius Ollivander, always called wands of this wood ‘the survivor’s wand,’ because he had sold it to three wizards who subsequently passed through mortal peril unscathed. There is no doubt that this wood, coming as it does from the most resilient of trees, produces wands that demand staying power and strength of purpose in their true owners, and that they are poor tools in the hands of the changeable and indecisive. Fir wands are particularly suited to Transfiguration, and favour owners of focused, strong-minded and, occasionally, intimidating demeanour.
Dragon Heartstring: As a rule, dragon heartstrings produce wands with the most power, and which are capable of the most flamboyant spells. Dragon wands tend to learn more quickly than other types. While they can change allegiance if won from their original master, they always bond strongly with the current owner.
The dragon wand tends to be easiest to turn to the Dark Arts, though it will not incline that way of its own accord. It is also the most prone of the three cores to accidents, being somewhat temperamental.
12 and 3/4 inches: In my experience, longer wands might suit taller wizards, but they tend to be drawn to bigger personalities, and those of a more spacious and dramatic style of magic.
Reasonably supple: Wand flexibility or rigidity denotes the degree of adaptability and willingness to change possessed by the wand-and-owner pair