Pure Derma London's Gua Sha & Roller sets are made of highest quality hand polished stone, ensuring longevity and durability. The Terahertz Gua Sha & Roller set is made from beautifully crafted stone. Terahertz can quickly absorb temperature and has the ability to penetrate up to 4cm below the skin, improving blood flow and circulation. Terahertz will remain cool to the touch, helping to reduce inflammation and puffiness, making it the ideal material for any skin care tool. Terahertz stone is reputed to slow down the ageing process as it revitalises inner energy flow and enhances circulation in the skin. Terahertz is a known as a powerful healing gemstone that increases blood circulation and stimulates metabolism and rejuvenation. The Terahertz stone is said to enhance inner body energy, generating calming frequencies and promoting stress release. 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!