What wood is used for katana tsuka?

I'm curious, what type of wood is typically utilized in the construction of a katana's tsuka, or handle? Is there a specific species that is preferred for its durability, strength, or aesthetic qualities? Additionally, how does the choice of wood contribute to the overall feel and balance of the sword when wielded by a skilled swordsman? Understanding the intricacies of katana construction fascinates me, and I would appreciate any insights you can provide.