Older style rollers, no use on belt. Great for workouts and improving bike balance.
Good for bikes with 26 inch or greater wheel diameter. The sidebars are aluminum; the rollers are mahogany with a synthetic coating. They seem in good condition, listed as fair since they are dirty from tread wear.
Do you remember the Bike Nashbar? I used to live a few minutes from their warehouse outlet near Youngstown, Ohio and would regularly visit to get some great deals. They were eventually bought up by Performance Bike. This is where I purchased the rollers.