Limited availability.   Kintsugi polishing charcoal, the best tool for sanding sabi and undercoat to middle coat urushi lacquer layer.  These charcoal are fired for 3 days in small brick kilns by specialists in Japan.  Mr. Hidoguchi is one of the 2 remaining artisans in Japan that produces polishing charcoal (or abrasive charcoal)  for lacquer craft use.   
 
We want you to experience and learn to cut your own charcoal. So they will be sold in blocks, sorted into Small Medium and Large.  And each one is priced by weight.  Weight / price will be listed for individual pieces and we will restock and post the next batch once sold out. 
 
There is no substitution for these artisanal charcoal.  They are all-natural material, and would not scratch the delicate surface of lacquer or fine pottery.  Suitable for kintsugi use, especially when repairing fine porcelain or antique pottery.  Generic store-bought kintsugi kit provides wet sandpaper which costs only a few cents and they easily scratch up the surface.   The next alternative would be whetstones which are synthetically bonded, we recommend whetstones over wet sandpaper as best alternative.  
 
For those seeking all-natural, authentic traditional kintsugi material, please try our abrasive charocal.  Once tried, there is no going back... I am afraid...LOL. It is originally invented / developed for lacquer craft use over a century ago.  Before there is sandpaper and grit#. 
 
We want to promote responsible traditional kintsugi practices. We capped our supplies as they are very precious in Japan.  Mr. Hidoguchi can only produce very small batch each time, and polishing charcoals are always in demand in the lacquer craft industries (because kintsugi and lacquer artisans would not use alternatives).  Orders are often made 1 year in advance for them, and we want to protect the industry and ensure availability to domestic lacquer craftsmen.
Be a responsible learner, pacticioner.   (No hoarding, no reselling please!)