I bought an old vintage smith's sold as "fine", marked "hard arkansas" 6x2 and sold as "hard" 4x2. I like the hard for finishing razors. It's got great feedback but the edge it gives is like butter and will cut you if you look at it wrong. I flattened them and smoothed to 220 and mild burnishing. The 6x2 is waxy and translucent, i believe it's a true hard. The 4x2 "hard" had a density of 2.5869.The shot as included is proof enough why a true hard is worth a shot. I like them. The Super Skrull of Arkansas finishing stones, capable of all forms...