Hello beautiful.
We think Hinoki sum this one up best themselves:
Hand-crafted from an expertly chosen selection of stainless steels the S1 Essential Wine Knife is designed to outlast your cellar. The blade in 420J2 selected for edge-retention and corrosion resistance, the body in a mix of SUS410 and SUS420J2 for durability and longevity. The S1 Essential Wine Knife is brushed signature Hinoki black and detailed in Nickel Silver on the thumb stud and pin, contributing to what is a genuinely seamless blade extension. A complement to any bottle of wine, an object of superlative craftsmanship.