I bought 3/8" cork coasters a while back, and got the wrong size, and the company was GREAT about it. They sent out new coasters in the right size as soon as they knew. They are equivalent to the ones I had bought from Crate and Barrel, several years ago. As far as the product goes---cork coasters are great, especially for coffee, when you don't want your coffee to get cold too fast. I also use one to put under my can of shaving cream in the shower, and it prevents getting an iron stain ring on...