Package Includes: There are 4 cup sleeves and 4 springs in the package, which can meet your daily replacement and storage needs. High Quality Materials: Made of abs and carbon steel, durable, long service life, good stability, impact 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 new mower. Ideal for patios, lawns, yards, gardens, cultural plants, landscaping, landscaping, etc. Various Uses: Compatible with black+ trimmer models decker afs gh400, gh500, gh600, cst1000, cst2000, nst2018, st7000, st6600 and st7700. It is suitable for agriculture, animal husbandry, aquaculture and forestry. Product Description: -Made of ABS + carbon steel. high quality carbon, good stability, impact resistance, cold resistance and oil resistance. -Just put the cover on the valve body, the spring makes it hard to fall off. -RC -100-P replaces the bobbin cover, used to use the automatic thread feed bobbin thread cutter. -It provides protection for the spool to prevent it from getting dirty. -The swimming cap is very small, light and easy to carry. Specifications: Material: ABS + Carbon Steel Color: As Shown Coil Cover Size: 8.6 x 3.4cm / 3.39 * 1.34in Spring Size: 2.3 x 3.6cm / 0.906 * 1.42in Quantity : 4 Pieces Package Include: 4 x Spare Spool Cap 4 x Spring Note: 1. Due to the light and screen setting difference, the color of this item may be slightly different from the pictures. 2. Due to different methods of manual measurement, please allow slight size difference.