Stainless Steel (density = 7.9 g/cc) - ~80 mL/pound Stainless steel beads can be used for the homogenization of tough samples or for special applications such as bacterial isolation. Bulk Stainless Steel Beads are sold by the pound (0.45 kg). UFO Beads are sold by the 50 mL package. RNAse-free Stainless Steel Beads are sold by the 4 mL package.