It's little hard but very smooth.
Specs:
Brand: Hitohira ひとひら (一片)
Product Type: Natural Stone
Mine: Shobudani
Producing Area: Kyoto/ Japan
Recommended Usage: Kitchen Knife (Edge), Kitchen Knfie (Bevel), Straight Razor, Chisel, Plane
Hardness (5 = Very Hard) : 3.2
Grain Scale (5 = Very Fine) : 4.2
Sharpening Speed (5 = Very Fast) : 4
Soaking Requirement: Not required
Size: 200 x 72 x 41mm
Weight: 1580g
Revied by Naoki Tsuda