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 3k stone is a good final stone, many will use this after the 1000 grit stone. This stone is fine enough to be used prior to the 8000 grit stone. These are splash-and-go stones, so no need for soaking prior to use. They measure 210mm x 70mm x 10mm.