... 1, high silica 2, great hardness 3, economical grinding media for ball mill 4, competitive price&professional service 1, Product Name: ... PEBBLEROUND(ELLIPSE)COLOUR OF PRODUCT AFTER BURNINGGRAY AND WHITE7, Product Size: 2-4cm, 4-6cm, 6-8cm, 8-10cm, 10- ... ceramic and related industries. Our main products are flint pebbles (man-made pebbles), natural pebbles (cobblestone) and silex blocks (silica lining ...