Medium ceramic grinding cylinders with angle-cut ends for use with standard 15 mL centrifuge tubes. Useful for mixing samples for extraction methods such as pesticide residue analysis (QuEChERS) or extracting oil from fish and seafood. The angle-cut ends help the cylinders to shear the sample matrix during processing that results in thorough extraction of analyte into the solvent. Typically, 2 cylinders are used per sample vial. Sold in bags of 100.