This 100 pack is bargain. Although since I ordered in Jan 2026 the price went up 20$ Still its enough wheels to retrofit 25 standard HO cars. At 1$ per car its a nice upgrade. The metal wheels add weight and lower the center of gravity considerably making a smoother and more stable riding car. Cars tend not to derail or tip over as easily and thats nice when you just want to sit back and watch your railroad run and not have to constantly be puting cars back on the tracks.They also replace the plastic wheels that come with Athern kits nicley.