These stones are natural with close density oil-tones, and excellent qualities that make them the stone unequaled for sharpening tools such as gravers, knives, etc. Comes in a cedar wood box and they are available in two types: translucent (extra fine); and hard (fine).
Translucent Stone Size 4" x 2" x ½" (102 x 51 x12.7mm)
Hard Size 6" x 2" x ½" (152 x 51 x 12.7 mm)