Naniwa 400,1000,5000 ComboThe Naniwa Professional line (previously known as the Chosera line) are super hard splash and go stones. These stones are slow wearing, fast cutting and HARD. They have a higher amount of abrasives and less binder than other lines from Naniwa, and are one of the best lines of stones money can buy in our opinion! Follow the links for more specs on each individual stone! This combo includes Naniwa Pro 400 Naniwa Pro 1000 Naniwa Pro 5000