Dr. Scholl's® One Step® Callus Removers provide a medicated treatment of your foot calluses, and contain salicylic acid USP 40% w/w for effective callus removal. These removers use an easy, one-step application, with no need to apply medicated discs and cushions separately. The built-in medicated disc works to remove the callus, while the cushion relieves pain caused by shoe pressure. They have been specially designed to provide immediate cushioning and pain relief from shoe pressure.