I buy them from the super Patch company. I don't have the package of patches in front of me as I am visiting Cancun with family. I use the Liberty Patch. They also make socks and insoles with the technology in them. It says one patch works for 24 hours, but I find I can wear it for 48 hours until it stops working. They guaranty to help you or money back within 30 days. I've been using them for around 2-3 years. I write the day I put it on it and time when applying so I know when to replace it.