Perfectly compatible with BLACK+DECKER RC-100-P trimmers. 4-piece trimmer caps and 4-piece springs meet your daily replacement and spare needs. Specially designed to protect the line and hold the spool in place, let your machine work again. Made of high quality metal and plastic, good stability, shock resistance, au cold and oil. Ideal for patios, lawns, yards, gardens, crops, landscaping, landscape workers, etc. . Specifications: Material: Metal, Plastic Product Spool Caps + 4PCS Springs Parts Perfectly compatible with BLACK+DECKER RC-100 String Trimmers -P. 4-piece cutter caps and 4-piece springs meet your daily replacement and spare needs. Specially designed to protect the line and maintain the spool in place, let your machine work again. Made of high quality metal and plastic, good stability, resistance to shocks, cold and oil. Ideal for terraces, lawns, yards, gardens, crops, landscaping, landscape workers, etc. . Specifications: Material: metal, plastic