but it's not mandatory

Scorpion series is available in 7 grits from F 80 to F 1500

but what makes lapping films unique is ultra-fine versions

3 mm stones are good as ultra-fine sharpening stones

Rosy Red - high-grade soft or hard stone with red veins

sigma power ceramic edge pro Grit:2000 but it's not mandatorySigma Power Ceramic sharpening stones are used for sharpening knives on Hapstone and Edge Pro knife sharpeners. Sigma Power Ceramic stones are made of aluminum oxide. All Sigma Power Ceramic stones are 5 6 mm thick and are mounted on high quality aluminum blanks. Sigma Power Ceramic stones are not available in wide range of grits. Sigma Power Ceramic line does not compose the set of even progression but offers "repository" of premium stones to make a