With my previous Fellowes shredder, I used liquid oil to lubricate the shredding mechanism. This had several major disadvantages. The oil tended to get all over the place despite precautions and would stain the area around the shredder aperture. Worse still, the oil would get on the shredder sensor. Eventually, the sensor was so coated with oil that I had to keep the shredder shut off because it would otherwise have run continuously. These lubricant sheets are extremely easy to use and cause no mess at all. The Bonsaii shredder is the best I have ever owned and the lubricant sheets make its maintenance an absolute breeze instead of a dreaded task. I expect that they will be more costly in the long run that the liquid oil, but any cost is worth avoiding the problems the oil creates and these sheets are almost certainly the answer. I highly recommend them.