These replacement sharpening blades are suitable for the Rapesco PS12-USB electric pencil sharpener. If the current sharpening blade no longer works properly, it is time to replace it. This can be done very easily by pushing the blade - safely packed in the sheath - up into the sharpener and pulling it out to remove the old sharpening blade. This package contains 3 Rapesco PS12-USB pencil sharpener blades.