I like these ss cups. There is a bit more heat transfer than I expected but not bad. A good capacity but not large. It appears the seam maybe on top rim center. This is concerning that something may get in and spoil and possibly making me sick. I hope not but time will tell. I will just keep an eye on that area for discoloration as signs of spoiled substance. I really dont have anything bad to say just the concerne of seam. I am glad I got them anyway. Oh and they are not overly heavy, quite lite actualy. Great for home or camping.