I will have to give credit to www.garagegymreviews.com (GGR); I ultimately searched for cast-iron plates that were relatively within a 3% certainty margin in terms of mass. GGR was able to help me accomplish this by pointing me in the direction of Vulcan Strength. Considering that this was more or less my first experience investing in gym equipment, I wanted to invest in an American-made product. Being a veteran, I was pleased to discover that Vulcan Strength not only provided American-made products but was also veteran-owned. After several purchases, I can admit that I have no complaints with Vulcan Strength. All of my products got delivered to my location with no concerns. The cast-iron plates are very sleek, the bumper plates are great for what I needed them for, and I could not be happier with my purchase.