Package Includes: There Are 4 Cup Sleeves And 4 Springs In The Package, Which Can Meet Your Daily Replacement And Storage Needs. Materials: Made Of Abs And Carbon Steel, Durable , Long Service Life, Good Stability, Shock Resistance, Cold Resistance And Oil Resistance. Unique Design: After Special Design, The Edge Can Last Longer On The Rough Surface. Aerodynamics Can Reduce Pipe Noise And Jitter. Unique Design: After Special Design, The Edge Can Last Longer On The Rough Surface. Aerodynamics Can Reduce Noise And Pipe Jitter. Easy To Install: Easy To Install And Save The Cost Of Buying A Mower. Ideal For Patios, Lawns, Yards, Gardens, Cultural Plants, Landscaping, Landscaping, Etc. Various Uses: Compatible With Black + Decker Afs Gh400 Trimmer Models , Gh500, Gh600, Cst1000, Cst2000, Nst2018, St7000, St6600 And St7700. It Is Suitable For Agriculture, l Husbandry, Aquaculture And Forestry.