Naniwa Chosera 5,000 grit Edge Pro Stone, 1"x6" with Aluminum Backing Custom made by Jende Industries, LLC. Fits all Edge Pro Apex and Pro Models, but also work well as travel stones and slip stones. 1" x 6" x 5mm mounted a standard 3mm thick aluminum edge pro blank. Uses water as a lubricant. Produces a razor sharp, shiny edge! Best when preceeded by a 1K, 2K or 3K Chosera EP Stone.