Premium Material: The trimmer replacement cord is made of high quality raw materials, the ABS spool is sturdy enough, the nylon cord is flexible, not easy to break, provides fast cutting and longer service life Time Saving: The spool design reduces air resistance and cuts more efficiently, allowing you to reach hard-to-reach edges of your garden lawn. The aerodynamic shape allows the line to stretch and absorb shock on hard surfaces, providing less resistance for more efficient cuts Fits Model: Compatible with PRTA 20-Li C3- IAN 351753, PRTA 20-Li C3- IAN 365589, PRTA 20-Li C3- IAN 385583, PRTA 20-Li C3- IAN 402319, PRTA 20-Li A1- IAN 311046, PRTA 20- Li B1- IAN 330831, PRTA 20-Li B2- IAN 334231, PRT 300 A1- IAN 360066, PRT 550 A1- IAN 311404, PRT 550 A3- IAN 351652, PRT 550 A3- IAN 330241 Excellent workmanship: Professional CNC cutting and automatic winding are safer and more time-saving than manual winding, quick and easy replacement without tools. Reduce damage to the trimmer and do not get stuck when mowing Precautions for use: Strong centrifugal force and fast cutting during use, it is recommended to wear protective glasses and long pants to avoid unnecessary injuries. And this cordless weed killer parts refill is only suitable for soft weeds. It is recommended to use blades to cut strong weeds