Heavy duty long travel Firestone sleeve airbag.
 
This bag comes in two different models found on all RI-FAB airride kits. (most kits made before 2022 came with plastic base bags, kits after 2022 typically have steel base bags.) (all 2-4'' front and all 0-2 rear kits come with plastic base, all bigger kits come with steel base.) 
 
Make sure to pay attention to the base materiel when ordering as they are different size airbags.
 
 
If we have them in stock the bags ship out same day if ordered before 2pm Pacific Time, we are a direct Firestone dealer and we usually have multiple pallets of bags always in stock.