The Benchmark Scientific D1033-28 Prefilled 2.0mL Tubes contain an appropriate amount of 2.8mm diameter stainless steel beads for bead homogenization. The tubes are ready to use: beads are alcohol washed and heat treated to remove contaminants and render them nuclease and protease free. Suitable for homogenization of tough, hard samples, muscle, plant materials, seeds and dried samples . The tubes are suitable for use in most bead homogenizers including the BeadBug 3, BeadBug 6 and BeadBlaster 24.