... Silica grinding ballsProperty: Round grayish silica stoneSize: 2-4cm, 4-6cm, 6-8cm, 8-10cm, 10-12cm, 12-15cmApplication: ... the SiO2 content in our silica pebble is more than 98%.3. Large output, our silica pebbles has been ... We welcome any interested customer come to visit us.4. Our own logistics company will provide you a better ... man-made pebbles (round,1-2cm,2-4cm,4-6cm,6-8cm,8-10cm,10-12cm,12-15cm)