4.5MM Stainless Steel Beads for tissue homogenization Bulk pack, bag of 400 Use for tissue homogenizer NA-01, NA-50, NA-01R, OP-TH01, FastPrep24, Precellys, TissueLyzer Be sure test a few samples on the first use. Your sample vials may be damaged during homogenization since these beads are larger in size therefore generating much more force in cell disrupting operation. Pre-filled tubes are available if you want avoid the time consuming bead loading process.