50 ml Premium High Alumina Ceramic Planetary Ball Mill Jar
· Grind Balls : alumina ceramic balls (should be ordered separately) Grind Ball Sizes : 3/5/10/15/20mm available. Choice of Grinding Jars amp; Grinding Balls. In order to prevent excessive abrasion, the hardness of the grinding jars used and of the grinding balls must be higher than that of the material used.