Food Service Warehouse is the best source for this product that I use every day. You can find these sponges from many sources on the net, but the price here is the best and the shipping is very fast.
We use this product daily to remove marine growth on the metal props and shafts of smaller boats we clean on a monthly basis. We have been using this particular product for over a year and have always been very pleased. We demand good stainless steel as we are using in the salt water.