Naniwa Aotoishi "Green Brick of Joy" 2K Grit Japanese Whetstone Sharpening Stone, NO Stand, 21cm x 7cm surface, 5.5cm thick.
This fine stone is a good choice for finishing off German knives, or for regular maintenance of any other German or Japanese knife where you don't necessarily want a super polished edge. This is the smoothest many people will ever need to use, especially for German knives or any knife made with standard stainless steel.
This is a "non-series" stone, so it's not really a Super Stone, Pro, or whatever... it's very thick, and it just has a certain something to it that many serious knife sharpening experts love, hence the "Green Brick of Joy" nickname!
A 5-minute soak prior to use is perfect for this stone (it's not a true splash-and-go like the Super Stones and Pro Stones). Don't leave it soaking for hours or more though.
Warranty: 90-day warranty against manufacturing defects.