From Apex comes the Apex Supra grinding stone of precious corundum. The sharpening stone is cream/grey in color and should be used with water. The upper side is used for knife sharpening while the lower side is placed against the bench. That side has an anti-slip coating to stay firmly in place.
We only recommend the purchase of a sharpening stone if you are sufficiently familiar with sharpening. Always start with another knife before sharpening your razor.