Pure Derma London's Gua Sha & Roller sets are made of highest quality hand polished stone, ensuring longevity and durability. The Black Obsidian Gua Sha & Roller set is made from beautifully crafted 100% naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth, naturally retaining warmth. Our natural Black Obsidian encourages stimulation of the lymphatic system and its properties are known for use on congested, inflamed and blemish-prone skin. It is said that Black Obsidian is a strongly protective stone it absorbs negative energies from the environment. Designed to relieve tension, increase circulation and improve lymphatic drainage in the facial area, helping to rejuvenate and re-invigorate, giving your face a more youthful and radiant glow. The act of massaging your face has a sculpting effect, and many can see this almost instantly as the puffiness in the face is gently reduced. Some use a Gua Sha stone with the aim of moving energy, known as qi or chi, around the body, removing blockages and allowing the energy to rebalance. Get firmer and more radiant skin with the cooling and soothing effects of the Gua Sha and Roller, order yours today and see for yourself!