... bigger articles from culture stone and artificial stone, such as cobble stone, castle stone, and art stone, etc.CSN-8540SHigh hardness ... bigger articles from culture stone and artificial stone, such as cobble stone, castle stone, and art stone, etc.CSN-8740SHigh ... bigger articles from culture stone and artificial stone, such as cobble stone, castle stone, and art stone, etc.CSN-8740SEHigh hardness ...