Each gemstone ball has been meticulously polished to ensure a smooth, effortless rolling action, providing even and consistent oil application. Say goodbye to frustrating experiences with rollers that stick or unexpectedly fall out. These gemstone rollers are designed for reliable and enjoyable use. Black Tourmaline is a powerful gemstone believed to offer protection, particularly for individuals sensitive to electromagnetic radiation. Many also find it beneficial during periods of spiritual development. Black Tourmaline is also thought to help alleviate feelings of fear and anxiety, fostering a greater sense of self-confidence and empowerment. Experience the potential benefits of Black Tourmaline with this unique and functional aromatherapy tool. SOLD IN SINGLE PIECES