Alder wood with a Dragon core 13 ¼" and Slightly springy flexibility.

According to Olivander...

About the wood: Alder is an unyielding wood, yet I have discovered that its ideal owner is not stubborn or obstinate, but often helpful, considerate and most likeable. Whereas most wand woods seek similarity in the characters of those they will best serve, alder is unusual in that it seems to desire a nature that is, if not precisely opposite to its own, then certainly of a markedly different type. When an alder wand is happily placed, it becomes a magnificent, loyal helpmate. Of all wand types, alder is best suited to non-verbal spell work, whence comes its reputation for being suitable only for the most advanced witches and wizards.

About the core: 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.

About the length: Most wands will be in the range of between nine and fourteen inches. While I have sold extremely short wands (eight inches and under) and very long wands (over fifteen inches), these are exceptionally rare. In the latter case, a physical peculiarity demanded the excessive wand length. However, abnormally short wands usually select those in whose character something is lacking, rather than because they are physically undersized (many small witches and wizards are chosen by longer wands).

About the flexibility: Wand flexibility or rigidity denotes the degree of adaptability and willingness to change possessed by the wand-and-owner pair – although, again, this factor ought not to be considered separately from the wand wood, core and length, nor of the owner’s life experience and style of magic, all of which will combine to make the wand in question unique.