Woolzies Muscle Relief Blend Roll-On is a convenient and soothing blend that can relieve sore muscles and joints. It has a fresh, warming, herbal aroma. The roll-on feature and compact size make it spillproof, travel-friendly, and airline-approved. On one end it has a roller and on the other end, it's a dropper. Muscle Relief Roll-On can be inhaled, diffused, and applied topically.