Naniwa Chosera 10,000 grit Edge Pro Stone, 1"x6" with Aluminum Backing Made to size by Naniwa Fits all Edge Pro Apex and Pro Models, but also work well as travel stones and slip stones. 1" x 6" x 5 mm mounted a standard 3 mm thick aluminum edge pro blank. Uses water as a lubricant. Produces a razor sharp, mirror edge! Best when preceded by a 3K or 5K Chosera EP Stone.