The Aero-Flex Gas & Battery Trimmer Upgrade Kit is a versatile and durable accessory designed for string trimmers, select battery trimmers, and virtually all gas trimmers. This kit, compatible with universal brand trimmers, provides power options with both gasoline and battery sources. The black plastic material ensures longevity and easy assembly is required for installation. The Aero-Flex B11 model is a reliable choice for maintaining your yard, garden, and outdoor spaces with precision and efficiency.