The 4 Pack Trimmer Spool Line is compatible with the Bosch EasyGrassCut models 23, 26, 18, and 18-230. It is a replacement line that is factory wound for a superior feed. The premium wearable line supports fast cutting and has a longer lifetime. The spool is made of high-quality ABS material and the thread is made of durable polyamide nylon, ensuring flexibility and a long service life. This trimmer spool line utilizes centrifugal force and aerodynamics to reduce drag and achieve fast cutting. It also features an Auto Feed System Replacement Spool, which eliminates the tedious work of hand-winding spools. It is important to note that strong centrifugal force and fast cutting are achieved during use, so it is recommended to wear eye protection and long trousers to avoid unnecessary injury. The package includes 4 spool lines. Please note that only the spool lines are included in the package, and other products are not included. The color of the item in the picture may appear slightly different from the real thing due to lighting and different displays. The allowed measurement error is +/- 1-3cm. Key Features: Compatible with Bosch EasyGrassCut models 23, 26, 18, and 18-230 Factory wound replacement line for superior feed Premium wearable line for fast cutting and longer lifetime High-quality ABS spool and durable polyamide nylon thread Utilizes centrifugal force and aerodynamics for reduced drag and fast cutting Auto Feed System Replacement Spool for easy use Includes 4 spool lines Color may vary slightly from picture, measurement error is +/- 1-3cm