Upgrade Electroplating Our nano-electroplating process enables pigments to penetrate deep into the metal. It works better than ordinary plating on metal surfaces, and takes longer than expected to make it shine and color. Solid Stainless Steel High quality solid stainless steel is strong and carefully sculpted, there won't be any sharp edges that will cause you discomfort, and the material is sourced more premium, this strap will probably outlast your other watch. Secondary Polishing Careful polishing and sanding are some of the factors that make Mastten 20mm stainless steel watch strap stand out than others. No risk to your skin and easy to clean. It is a qualified companion for your watch. Compatible models: Samsung Galaxy Watch 4 Classic 46mm 42mm（2021） Samsung Galaxy Watch 4 44mm 40mm （2021）