WOOX Arkansas Sharpening Stone Whetstone. A natural whetstone for sharpening any blade or tool. Our whetstones are mined in the Ouachita Mountains of Arkansas. The stones are made of Novaculite a rock made of quartz crystals which give our Arkansas stones their unique sharpening ability. These crystals have a Mohs hardness of 7 which is much harder than any other steel used for making knives accessories. To use our Arkansas whetstones we recommend to use water as lubricant because it is thinner than oils. After each use our whetstones should be cleaned by wiping the excess water with our Bamboo cloth and then clean the stone with soapy water. Specifications for WOOX Arkansas Sharpening Stone: Manufacturer: WOOX Fabric/Material: Novaculite Color: Grey Length: 3 in Width: 1 in Height: 0.25 in Condition: New Package Contents: WOOX Arkansas Sharpening Stone WOOX BU.SHR001.01: Arkansas Sharpening Stone Whetstone