BioSpec 11079107zx Zirconia Bead, 0.7mm Diameter
Zirconia has a density of 5.5g/cc. 100 Percent more dense than glass. Good for tough tissue. Most bead media is reusable. Wash with lab detergent (not acid) and rinse well. Bead is sold in one pound bottle. 0.7mm Diameter.