Diamond/ceramic whetstone. Features: The newly-developed DC3 and DC4 whetstones consist of a fine diamond stone (25 micron) and a very special ceramic stone, made of synthetic sapphires. The advantage of these materials, although they get worn, will still keep their flat shape this is important when you sharpen your knife. You don’t need any lubrication for these stone but now and then you should consider cleaning them with warm water and liquid soap. A leather pouch is included. Dimensions: 7 x 32 x 100 mm. Weight: 65 g.