Ceramic, copper, POM glass, casting iron, stone materials available Features:1) AISI 1010, AISI 1015, AISI ... 420C, AISI 440C, TC94Wo6, TC85, 5Wo12Cr2.5,TC90Co5Ch2Ni3 available2) Ceramic, copper, POM glass, casting iron, stone materials availableSpecifications:1) REDMAN carbon steel ... , AISI420C, AISI440Cb) Grade: G10 - G200c) Diameters: 0.40mm - 30mm 9/64" Steel Ball