I purchased the CeramicEdge blades and I love them. They are very sharp and a great replacement for the original blades on my Oster A5. It's amazing what amazing what a new set of blades will do for an old pair of clippers. They work like new! I don't clip my horses, but I use them to roach manes, trim fetlocks, and shave my longhaired cat. They work great and made quick, clean work of my cats matted hair! Not to mention they neatly ate through my horse's tough main hairs. I get a lot of use out of these blades!