This is a Shop For Vapors by a Vapor, everything I sell is tested and approved by yours truly. If for any reason it's not to your liking or there is a problem with your order just contact me and I will make it right. Stop shopping at the Candy Shop "Co Op" and start saving money by making your own Concentrate tanks at home. Need Info on how to mix or just need some advice on Flavor profiles you might like just e mail me. Just a Normal guy selling USA top quality vaping products. Happy vaping!