Hypoallergenic Material：Disposable Empty Belly Button Patch is made of breathable hydroentangled nonwoven fabric that is skin-friendly and hypoallergenic with no residual adhesive. Safe to use even for those with sensitive skin. Packaging Specification：Measures 7 cm x 7 cm, 2.8 inches x 2.8 inches, can be firmly affixed to all parts of the body without shifting. Strong adhesive, not easy to buckle and fall off, easy to wear daily. How to Use：First take out the patch, peel off the release paper, add a few tablespoons of castor oil, stick it on your belly button with a hot water bottle or heating pad on top, and remove the patch when you are done. (Note: Do not get castor oil on the outside of the inner ring) Widely Used：You can wear this Disposable Empty Belly Button Patch while working, sleeping or even doing yoga, take it anytime and cover more life scenarios. Just replace it, no need to wash it. Save your precious time and energy. Soft and Comfortable: The round leak-proof frame and waterproof polyurethane layer provide double protection to securely lock the oils inside the patches. You don't have to worry about spills even after long hours of wear. (Note: Castor oil free)