1Fitment: The engine air filter is a replacement for Viking MB 448.1 T, replacement for STIHL RMA 448.1, please check the model and brand before ordering. 2Function: The air intake filter could prevent air from entering your engine, protecting internal components from premature wear. 3Durable Material: The air filter is made of high strength shell, and the inner part adopts paper material, has better heat resistant, anti aging, high strength. 4Fine Workmanship: Stable performance, better filtration effect, professional manufactured, exquisite workmanship with unique design, durable and high reliability. 5Easy to Install: Stringently manufactured to meet the original standard, good replacement for the old or broken one, improving the time efficiency.