(Oster) Oster clipper blades are produced using Cryogen-X technology. Cryogen-X clipper blades are cryogenically treated to produce a harder, more dense metal that maintains a sharper edge. Sharper clipper blades glide through coats more easily and keep clipping temperatures cooler. Oster clipper blades have AgION antimicrobial protection built in to prevent the growth of bacteria, mold and mildew. Oster Cryogen-X clipper blades are standard replacement blades for A-5 clippers.