Salonpas Lidocaine Pain Relieving Gel-Patch uses hydro-gel based technology plus maximum OTC strength 4% Lidocaine to provide numbing relief. This patch provides unscented, temporary numbing relief of pain associated with back, neck, shoulders, knees and elbows. Rounded corners provide better adhesion. A center-cut film creates an easy application. Targeted, Numbing Relief to Backaches, Injuries & More Don't let the pain associated with backaches, neck tension, shoulder discomfort, and knee injuries slow you down. Our patches offer targeted, temporary relief, allowing you to move with ease and comfort. And they're not just...