Thank you for showing your interest in Superior Silver Reusable Electrode 2" X 2", 4/pk from Unipatch (UP). The Superior Silver Reusable Electrode 2" X 2", 4/pk is a product of Unipatch and is thereby made of the highest quality. If you have any questions regarding Superior Silver Reusable Electrode 2" X 2", 4/pk or any product in Unipatch (UP), please contact us. Our experienced personnel will answer any questions you have about Superior Silver Reusable Electrode 2" X 2", 4/pk. Also, if you are interested in purchasing large quantities of Superior Silver Reusable Electrode 2" X 2", 4/pk or any Unipatch (UP), please contact Customer Service.