The START International TDA080P279S Replacement Serrated Edge Blades are designed for use with the TDA080 series of Electric Tape Dispensers. These Serrated Edge Blades are ideal for the majority of tapes. Extremely thick and aggressive tapes require the TDA080P279FS replacement blades, which are also available to purchase on Amazon. The TDA080 series of Electric Tape Dispensers are sold with the serrated TDA080P279S blades. The TDA080P279 straight edge blades are a less expensive replacement option if the application requires the use of thin and mildly aggressive tape. The TDA080P279, TDA80P279S and TDA080P279FS are all available for purchase from Amazon.