Effective relieve of back aches and pains, joint stiffness and arthritis. Provides up to 8 hours of comforting, deep penetrating warmth. Odourless and non-staining. 2 patches of 9.5cm x 26.5cm Deep Heat Back Patches provide up to 8 hours of comforting, deep penetrating warmth for the effective relief of muscular aches and pains, joint stiffness, strains and sprains. Ideal for use on the lower and upper back, and shoulders. Deep Heat Back Patches are also ideal for sufferers of menstrual cramps. Directions Apply on clean dry skin. Open pack, remove protective film from patch. Apply adhesive side of patch to the skin at the centre of the affected area. On flexible joints it may be helpful to use dressing tape to hold the patch firmly in place. The air activated charcoal Deep Heat patch will heat up after 5 minutes and remain warm for up to 8 hours. Warning Deep Heat patches are single use only. DO NOT attempt to reheat in oven or microwave. Use only 1 patch on the same area in 24 hours. Discontinue use if skin sensitivity occurs. Do not use on: Broken skin or on bruises. Face or mucous membranes. Children or other persons requiring supervision or whilst asleep. If you are diabetic, pregnant, have poor circulation, nerve damage or a skin condition, consult your doctor before use.