Shapton Glass Stones are known for their exceptional quality, durability and ease of use. Unlike other waterstones, Shapton Glass Stones do not need to be soaked in water before use - simply wet the surface and begin honing your blade.Shapton sharpening stones are made with finely graded ceramic cutting media that requires less flattening and lasts 4-5 times longer than most water stones. The abrasives in glass stones are also extremely uniform, meaning the abrasive encountered with the first pass of a blade will be the same as the 5000th pass.Each stone is comprised of a 5mm tempered glass backing plate fused to a 5mm thick stone. The #4000 grit stone has a particle size of 3.68 microns and is ideal for sharpening a straight razor. Used in combination with the #8000 grit stone, you'll have an edge that you can shave with. We recommend using the Shapton Stone Holder to hold the stone in place when in use.