This is a small round-shaped heat-type medical patch (plaster), the active ingredient (4-Hydroxy-3-methoxybenzyl Nonylic Acid Amide) of which produces tingling heat stimulation that improves the blood flow in the affected area, relieving shoulder stiffness and lower back pain. Key features ● Apply directly on painful or stiff areas to relieve pain ● Comes with a storage bag How to use this product Please peel away the film which is attached to the plaster side of the ROIHI-TSUBOKO and attach the tape directly onto the painful area. Intended purpose Shoulder pain, back pain, bruises, sprains, pain in joints, muscular pain, muscle fatigue, chilblains, pains caused by bone fractures. Be sure to remove ROIHI-TSUBOKO before taking a bath. If you take a bath with the plaster attached, you may experience a burning sensation in the area where the plaster is attached. Be sure to remove ROIHI-TSUBOKO 30 minutes to one hour before taking a bath. Please be careful when using in combination with other heat-generating devices (kotatsu foot warmer, electric carpet, disposable heating pads, electric blankets, etc.) as this may intensify the heat stimulation.