Hmmm can't say I know which brand of pans these are. I would recommend investing in good quality baking pans from safe websites like GSA or Amazon. You don't want to end up with a set of pans that bend when you pour batter into it (this has happened to me and it is a wobbly mess to move to the oven and very risky) or square pans that are not joined properly at the corners (I have square pans that were not made properly and leak batter in the oven..literally drip batter and mess up my oven. Imagine that! *Throws out window. Go for more reputable known brands cuz you're gonna have these pans for the next 5 yrs at least!
You can email the seller to find out the total weight of each set. You should also ask how each tin was soldered at the seams.
These are tinned steel pans which are suitable for fruitcake but not for general production baking. They must be carefully dried after hand washing.
There is another ebay vendor in the UK that has heavier weight pan sets for sale. Take a look at the details