TGS Gems Natural Mushroom Massage Stones Black Obsidian & White Jade Health and Fitness Body Pressure Trigger Point Massage With 2Pcs Material: Black Obsidian & White Jade Size approx:1.65"x1.65"x1.2" Weight approx 202g &gt;Massage stone is a kind of modern beauty SPA massage therapy of traditional Chinese medicine health,Very suitable for pointed pain relief and trigger point therapy Smooth surface is very skin-friendly and is not harmful to your skin. The picture is only for your reference,The stone you received will be similar because of the natural stones