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Solid Borosilicate Glass Precision Spheres, Beads, Dry Powder -Density 2.2g/cc - Sizes between 2.0mm and 7.0mm
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Alpha Nanotech Sterile Borosilicate Solid Glass Beads (3 mm, 0.5 kg / 1.1 lb): Amazon.com: Industrial & Scientific
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Bondline Spacers - Solid Borosilicate Glass Microspheres, Beads, Particles - Density 2.2g/cc - 100 micron to 200 micron (0.2mm) Diameter - Calibration Grade - Monodisperse Spheres
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