Heavy duty build. I bought them for my kid when he was in football. He quit football after a couple months and hardly used them. He moved out to California and they just sat in his room. I have no use for them. I'm old and got a bad foot and ankle...I need to lose weight, not gain weight! The pullout weights look to be cast iron and weigh about 2 pounds 6 ounces each. Some of the Velcro picked up some lint, otherwise very clean, and stored in a nonsmoking, climate controlled home.
Website photos are for illustration. I don't know if these are the exact models, but they look to be the ones. My kid picked them out and I just paid the bill, so don't know anything about them other than they were expensive.