... Stone,Lava Stone,Lava Basalt,Large Hole Basalt 1) Grey color with special large holes 2) Customized sizes accepted. Large Hole Basalt ,Lava Basalt, Lava Stone, ... Grey basalt, Volcanic stone,Size 30x30, 30x60, 40x60, 60x60, 120x60cm,etc ... ., with all kinds of shapes and thickness. Volcanic Lava Stone,Lava Basalt,Large Hole Basalt