volcanic granule

Volcanic Granule

The volcanic granule are made from small holes volcanic lava. The size is 1-2cm , 2-4cm or 4-8cm etc. It's porous, hard and grey color, also can absorb sound ,dust and heat. It use widely for water strainer, potted plant,sauna and barbecue etc. The volcanic granule is a ideal nature material. Please look at http://www.volcanic.cn for more information.