This is significant because:
* Walnut wood: Wands made with walnut wood are known for their strong and independent natures, reflecting Bellatrix's fierce loyalty and unwavering devotion to Lord Voldemort.
* Phoenix feather core: Phoenix feather cores are among the most powerful wand cores, reflecting Bellatrix's exceptional magical ability and dark power.
However, the specific length and flexibility of her wand is never stated in the books.