Soil grinding SK38_7mL - Mix of glass and Zirconium oxide beads-7mL pre filled tubes ; Lysing kit for Precellys - SK38 Soil kit - 7mL tubes 50 prep. The SK38 kit is composed of a complex matrix containing 0.1mm glass beads, 1.4mm ceramic (zirconium oxide) beads and a 3mm glass bead. This kit is specially indicated for the extraction of DNA/RNA/Protein from micro-organisms such as bacteria, parasites, yeasts contained in a complex sample like soils, sediments, feces etc. from 200mg to 2g.