Suehiro is one of the leading professional sharpening stone manufacturer in Japan, and the Creax line is their top of the range sharpening stones for both tools and kitchen knives. I really like Suehiro stones because they give excellent feedback and superb cutting speed. Please soak the stone for 5 minutes before using.
Cerax 5050 has the same abrasive as Rika, one of the most highly regarded offering from Suehiro, with great feedback, great speed on carbon steel and gives an excellent finish.
Measurement: 206mm x 73mm x 23mm