These Heat Pads provide effective relief for strains and sprains, period pains, backache, joint stiffness, muscular pain and muscular aches. Applied directly to your skin, they give targeted heat therapy. They're also fragrance free, non-medicinal, discreet and thin so you can wear them while you're out and about. Ingredients - iron powder, water, vermiculite, activated carbon, salt. Warning: Keep out of reach of children. Always read the instructions before use - heat pads can cause burns at low temperatures if misused.