Compatibility: The thread spools are compatible with RYOBI String Trimmer models 310917001, 3110382AG, 522994001, 993373001, 3411546-7G, HM34515, 4CG1AG, 4AG156, 4CG, 4AG, 4AG, 4AG, 3411546BG (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 keep the wire trimmer in optimal condition. Optimal size: Each wire spool has a diameter of 5.5 cm and a length of 3.3 m, ensuring efficient and precise mowing for 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