RAPID MICRO TECHNOLOGY This chain could use RAPID MICRO technology, which stands for fast and precise cutting. Type 26RM 3686/67: This designation indicates information about the chain type, the number of teeth (67 teeth), the chain link and the cutting length measurement (40 cm). Fits certain Stihl models: the chain may fit specific Stihl chainsaw models whose length and tooth count match the specifications of the replacement chain. Precise and fast cutting: the chain can be suitable for various cutting tasks, such as cutting wood, and provide high cutting performance. HIGH QUALITY MATERIALS It is likely that this chain is made of high quality materials to ensure long life and high performance.