The base of all Damascus steel is the same: multiple layers of different types of steel (often high-carbon and low-carbon) are forge-welded together. These layers are then folded and manipulated repeatedly, sometimes hundreds of times, to create a laminated billet. For raindrop Damascus, the surface is specifically punched or ground in a circular manner before being forged flat again—... https://www.dskkblade.com/collections/santoku-knives