The STIHL Polycut Replacement Blades are designed specifically for 2-stroke engines, with a pack of 12 blades included for easy replacement. These white blades are compatible with STIHL brush cutters, including models FS38, 40, FS50, FS55, and FS56. Assembly is required, but these OEM blades are a reliable choice for maintaining your yard and garden in top condition. Trust in the STIHL brand for quality and performance in outdoor power equipment.