... you need; 5.High quality Black Pebble:1.Nature black pebble Stone2.Polished black pebble;3.River black pebble;4.size as you need ... ,5-8 cm,6-9 cm,8-12 cm;Color: black, red, white, pink, yellow, green, grey, multicolorBigger size: can be ... .9%Other metal contentDoes not exceed the national standardAnti-stress(Kg/cm2)690SRS Stone in China which is an enterprise combining ...