These Triple-Pure Starter Kit, High impact Zirconium Beads, and come with standard acid-washed glass beads, triple-pure zirconium beads, or stainless steel beads. The triple-pure beads are molecular biology grade, and are acid washed, heat treated and tested free of nuclease. The stainless steel beads are acid-washed as well. All tubes are non-skirted with screw-cap. Compatible with BeadBug™ Microtube homogenizer RS7020, BeadBlaster™ Microtube homogenizer D8400.