This is a bundle sale of the following tubes: 1- IRC IX-Heavy Duty 140/80-18 Rear tube. Brand new. 2-IRC IX- Heavy Duty 80/100-21 Front tube. Brand new. 2- Used 18" standard duty rear tubes that may have been patched. 1- Used 21" standard duty front tube that may have been patched. We carried standard thickness tubes in our backpacks (the used ones listed above) to use as spares when we got flats while out riding. Once we got back from the ride, we would take out the regular tubes and install new heavy duty ones and put the lighter ones back in the pack for the next time we got a flat.