Japanese Natural Whetstone
1345g
216 x 78 x 30
Lacquered on all sides. 
Please do your own research on Japanese natural stones before purchasing. 
Just on the right side of hardness for knife sharpening and will self slurry. 
Will give you a finer bitey edge. 
Use on final stages of polishing. 
Some air holes that have not caused me any issues during use.