Features1 Filter Paper: This trimmer air filter is made of filter paper materials, which is durable, wear resistant and has long service life. 2High Accuracy: The professional manufacturing, exquisite workmanship and high accuracy help to provide the best performance. 3Practical: The trimmer air filter replacement is the accessory of garden tools, which can effectively extend the service life of the machine. 4 ly Matching: The trimmer air filter panel has stable performance that it can ly match your machine for your trimmer's long service life. 5 Pieces: The delivery includes 5 pieces and they are applicable to for Stihl FS91 that you can use them for a long time.SpecificationItem Type: Trimmer Air FilterMaterial: Filter paperGross Weight: 87g/3.1ozApplicable to: For Stihl FS91 trimmerScope of Application: Gardening, garden toolsPackage List5 xTrimmer Air Filter