Subheading 4107.91 · Section VIII
Leather; further prepared after tanning or crusting, including parchment-dressed, of bovine (including buffalo) or equine animals, without hair on, other than leather of heading 41.14, not whole hides and skins, but including sides, full grain, unsplit
Source: Harmonized System 2022 edition (World Customs Organization), from the UN Comtrade classification list.