Condition: Size: 8 * 8 cm/3.14 x 3.14 in (Length x Width ) Note: please pay attention to the size . the photo is for reference .it is a natural energy of rock, some rock have a little texture on the stone Features: Material: volcanic stone Color: Black These are naturally harvested, unpolished Basalt used for hot stone massage . The Basalt used for bodywork were created by the long, slow cooling of molten lava spewed from volcanoes located in different regions of the world. These Basalt are chosen for massage since they retain heat any other kind of stone due to their high iron and content as as their extraordinary density. Hot stone massage is a unique of massage that employs heated to release tension and calm the nervous system. Package Included: 2 * Massage Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.