This is a brand new, factory-sealed Oster Professional Cryotech Combo Set, model 78511-126 (61511-12). This set includes both the upper and lower blades, specifically designed for Oster ClipMaster Clipping Machines. Featuring Cryotech technology for significantly longer wear life, these blades are crafted in the USA ensuring high quality and durability. Ideal for professionals seeking reliable replacement blades to maintain peak performance of their grooming equipment. Please ensure compatibility with your ClipMaster machine before purchasing.