IN-1 White: Very hard matrix, good-quality diamond grit, high concentration, and lower penetration rates obtainable
IN-5 Purple: Hard soft tough fairly free cutting, good-quality diamond grit, low concentration, and reasonable penetration rates obtainable
IN-7 Green: Tough, reasonably free cutting, good-quality diamond grit, medium to high concentration with good penetration rates.
IN-8 Red & IN-9 Orange: Tough, free cutting, good-quality diamond grit, high concentration, and very god penetration rates
IN-11 Silver, IN-11F Gold & IN-CH Yellow: Very tough,free cutting, high quality diamond grit, high concentration with great penetration rates
IN-10 Black, IN-12 Light Blue & IN-14 Navy Blue: Matrix of high quality pelletized diamond grit, high concentration, and high penetration rates obtainable.