Fellowes 4 SafeCut Rotary Trimmer Blades, Straight, 2 Pack (5411402) The Fellowes SafeCut stainless steel straight rotary replacement blade kit is ideal for users with frequent cutting needs. Each SafeCut cartridge has a retractable blade that only engages during cutting to prevent contact with blade surface. Kit includes two straight SafeCut stainless steel rotary blades. For use with Fellowes Neutron/ Neutron Plus, Proton, and Electron Trimmers. 2 pack.