自有矿山和工厂，可以提供优惠的出厂价We have our own quarry and factory in Hainan,China and grey and black basalt in store currently Which guarantees the lowest factory price. In addition,the Hainnan basalt is rarely mining in China,even on the market. Actually we have closed several basalt deals in last month, mainly in South Korea,Germany ,Jpan,USA.etc. -------------------------------------------------------------------------------- 1) Our general specification about basalt grey are (cut to size): 60*60*2 or 3cm 60*30*2 or 3cm 2) The maximum size of basalt are:100* 70*2 or 3cm 100 * 80*2 or 3cm Your specifications about sizes are welcomed too. The mesopore is grey basalt ,while the black basalt is micropore