This is a single sided 4000 grit Whetstone (Toishi) without a base, a good finishing stone for knives that don't need a more honed edge. This fine grit whetstone is on lower in grit and closer to a medium than most fine grit whetstones.
Japanese Sharpening Stone / Whetstone (Toishi) - Grit #4000
Weight: 733 g
Whetstone Length: 205 mm
Whetstone Width: 75 mm
Whetstone Thickness: 25 mm
Whetstone Thickness: 25 mm