My old factory nuts were slipping on chrome caps that slipped off after 15 years. These are strong, heavy, solid nuts that make my old D'go feel less like a wrestling buggy. Wally's world won't touch your wheels if you don't have nuts and I was wrongly rejected 3 times because my old nuts were there but some didn't have caps. Now they can do my balance and rotation, which I paid for in advance, without arguing about the lack of equipment.