Harry’s first wand – eleven inches, holly and phoenix feather – had fit Harry, then. It had been battle ready, protective, glowing warmly in his hand and feeling exactly right for a boy who needed the small buzz of defense from a wand built to protect and defend.
The wand he replaces it with, though, is made of fir (a wood Olivander told him quietly was often referred to as “the survivor’s wand”), with a tail hair from a threshal at it’s core. It is a wand that holds all the wisdom of death and suffering, and a wand that can get Harry through the restructuring of his life after death.
It serves him well for nearly eighty years.