Usage Tips:Compatibility: The thread spools are compatible with RYOBI String Trimmer, models 310917001,3110382AG, 522994001,993373001,3411546-7G, HM34515, 4CG1AG, 4AG156, 4CG, 4AG, 4AG, 4AG 411546BG (18V, 24V, 40V). Premium quality: The parts are made of high-quality materials such as ABS, nylon and fiberglass, to withstand tough trimming tasks and provide long-lasting high performance. The included protective cover helps to keep the wire trimmer in optimal condition. Optimal size: Each wire spool has a diameter of 5.5 cm and a generous length of 3.3 m, ensuring efficient and precise mowing and a neat and tidy lawn. Specifications: Color: Black, blue and gray Materials: ABS, nylon and glass fiber Coil diameter: 5.5 x 2.3 cm Trimmer wire length: 3.3 m Compatible with: RYOBI String Trimmer, models 310917001, 3110382AG, 3110382G, 522994001, 993373001,3411546-7G, HM34515, 4CG1AG, 4AG156, 4CG, 4AG, 4AG, 4AG , 3411546BG (18V, 24V, 40V) Package includes: 6 x trimmer spools with trimmer wire for grass trimmer 1 x protective cap Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.