hello, everyone! this is our product glass beads. We are one of the biggest glass beads manufacturers in China----XiaGuang Glass Beads Co.,Ltd. We have our own factory and quality control systems in our lab to keep quality stable. Our CAMSIZER equipment can strictly test the roundness and size distribution during the production process. we also have heavy metal test equipment can meets your requirements. if you are interested, please contact us or visit our company website www. xgbead.com. thanks.