When purchasing black leather office chairs, you as the buyer must make a decision as to whether to buy a chair with 100% leather used for both backsides and seat facings or to choose a chair that uses vinyl for the back and sides and leather for the seats. This decision can amount to savings of up to 2/3rds the price for the full leather chair. Also, chairs that use the more durable matching vinyl for the seat backs and sides can be expected to last much longer. Most reputable online office furniture merchants will specify in their item description the percentage of actual leather used in every chair.