<https://www.glass-microspheres.com/product/grinding-glass-bead/#webpage>
<http://schema.org/description>
"You can choose from the Nanjing Liwei Chemical Co., LTD in different sizes such as 4mm, 6mm,2mm and other grinding glass microspheres."
<http://ru.glass-microspheres.com/Grinding-Glass-Bead.htm>