This is Stihl's maintenance kit for the STIHL TS 410, TS 420 and TS 440 power cutter intended for individuals and professionals. With the Service kit n ° 35 for TS 410, TS 420 and TS 440, use maintenance parts that are easy and quick to install in order to optimize the performance, reliability and durability of your machine. Optimum performance from your machine, it is recommended that you change the air filter, spark plug, and strainer every 100 hours of use.