Shirasaya refers to a specific type of Japanese sword mounting consisting of a plain wooden scabbard and handle without ornate fittings. Shirasaya were typically used for storage, transportation, and maintenance of the sword rather than for active combat. Here are some key uses and purposes of Shirasaya:

1. Sword Preservation: Shirasaya were primarily used to preserve and protect the blade of a Japanese sword. The plain wooden scabbard and handle provided a simple, clean, and protective covering for the blade when it was not in use. The snug fit inside the Shirasaya helped prevent exposure to moisture, dust, and other elements that could potentially damage the sword.
2. Maintenance and Inspection: Shirasaya allowed for easy access to the sword for maintenance and inspection. The absence of elaborate fittings and ornaments simplified the process of cleaning, oiling, and checking the blade for any signs of wear, rust, or other damage. This facilitated regular upkeep and ensured the sword remained in good condition.
3. Safe Storage and Transportation: Shirasaya provided a secure and compact method of storing and transporting the sword. The wooden scabbard kept the blade protected, reducing the risk of accidental damage or injury during handling or movement. Shirasaya were often used when the sword was not being actively carried or displayed, such as during travel or when the sword was kept in a personal collection.

It's important to note that while Shirasaya were primarily used for practical purposes, they can also be appreciated for their minimalist aesthetic appeal. The simplicity and elegance of the plain wooden scabbard and handle highlight the natural beauty of the sword blade itself.

During active use, swords stored in Shirasaya would typically be removed and fitted into a more decorative and functional mounting, such as a traditional koshirae, which would include a more elaborate scabbard, guard, and other ornate fittings suitable for ceremonial, display, or combat purposes.