The Naniwa Super Stones are made with a resin bond, which allows for a higher level of abrasive particles compared with less expensive methods of stone bonding. The higher abrasive levels contribute to the speed of sharpening. This 5k stone is a good final grit for many knives and works well after the 1000 grit. This stone is also fine enough to be a good stone prior to the 10,000 or 12,000 grit. These are splash-and-go stones, so no need for soaking prior to use. They measure 210mm x 70mm x 10mm.