Mikawa nagura tenjyo layer 130gr. Used to create slurry with Japanese natural whetstones. The nagura slurry will brake down faster than the one of the Whetstone. The slurry is also used for final polishing especially when from finer layers. Always use a clean diamond plate and wash your nagura with care or it will be contaminated. Always allow the nagura to absorb some water prior to use. You will receive one from my stock, the weight is the same, the shape and the colour will change as with every natural product.