Sushi knives are typically long, thin, and pointed, with a very sharp blade that allows for clean and precise cuts through delicate fish and ingredients.

Sushi knives are typically made with high-carbon steel, stainless steel, or a combination of both. The handles can be made from a variety of materials, including wood or synthetic materials like resin or rubber.

While sushi knives are specifically designed for cutting and preparing sushi, they can also be used for a variety of other tasks in the kitchen, such as slicing meats, fruits, and vegetables.

Sushi knives should be sharpened with a whetstone, which allows for precision sharpening and better control over the angle and pressure of the sharpening process.

To avoid dulling the blade or causing damage, it's important to clean and dry your sushi knife after each use and to store it in a protective cover or sheath to prevent exposure to moisture or other elements.

When selecting a sushi knife, consider the size and shape of the blade, as well as the thickness and material of the handle. Choose a knife that feels comfortable in your hand and suits the size and type of fish or other ingredients you'll be cutting.

While sushi knives are primarily designed for indoor use in the kitchen, they can be used for outdoor cooking as well, as long as proper care is taken to prevent exposure to moisture and other elements.

Most sushi knives come pre-sharpened, but it's always a good idea to double-check and make sure the blade is sharp enough to ensure precision cuts and avoid damaging the fish or other ingredients.

The frequency of sharpening will depend on how often you use the knife and how much wear and tear it experiences, but most chefs recommend sharpening your sushi knife every few months to maintain optimal sharpness.

While a regular chef's knife can be used to prepare sushi, it's generally not recommended, as the thicker and heavier blade can make it more difficult to achieve the precision and delicacy required for sushi preparation. A specialized sushi knife is best for achieving professional-level cuts and results.