Our shark is almost 2 years old. While doing maintenance and trying to figure out why we had lost suction (cardboard, who knew? LOL) I noticed the little wheels were rusty and when I put them back on one of the wheels was deformed making the suction strong impaired. and performance. These wheels fit great and the metal looks a lot less prone to rust. The vacuum cleaner works like new again. Great replacement product. Very easy to install.