1、Fit Models: Exhaust muffler kit replacement for Stihl 064 065 066 MS640 MS650 MS660 chainsaws and you need buy it with carefully know the type. 2、Main Function: Exhaust muffler set with high quality parts are used to reduce the noise generated by the chain saw engine and easy to use. 3、High Quality Material: Exhaust muffler kit is made of high quality metal material, durable and wear resistant, and has a long service life. 4、Good Performance: Exhaust muffler kit with professional manufacturing, superb craftsmanship and high precision help to provide the best performance. 5、Complete Package: Kit includes 1 Exhaust Muffler, 1 Muffler Gasket, 2 Spline Screws M5x6, 2 Spline Screws M5x16, 2 Spline Screws M6x20. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin