Polished 100mL stainless steel (grade 304) grinding jars for planetary ball mills. Each jar set includes grinding jar, lid, silicon sealing gasket and a mixed sizes of stainless steel grinding balls.

Grade 304 is the most widely used austenite steel, also known as 18/8 for its composition of 18% chromium and 8% nickel. 304 may be referred to as A2 stainless (not to be confused with A2 grade steel, also named Tool steel, a steel).