Made of highest quality material</br>Manufacturer: Spyderco?? Inc.</br>Spyderco Tri-Angle stone sharpener medium-grit</br></br>Product Description</br></br>This medium grit (brown) ceramic Stone is a replacement item for the ones included in the 204MF Tri-Angle Sharpmaker sharpening system. Designed to be used dry?? it is easily cleaned with household cleanser?? a scouring pad?? and water. 7"5" (178mm x 13mm)</br><br/>http://www.amazon.com/gp/product/B000Q9C4A4aati