Premium quality: Made with high-quality ABS spool and durable nylon thread. Not easy to break, supports fast cutting and longer service life, can cut weeds easily and efficiently. Compatibility: compatible with Parkside: PRTA 20-Li A1-IAN 311046, PRTA 20-Li B1-IAN 330831, PRTA 20-Li B2-IAN 334231, PRTA 20-Li C3-IAN 351753, PRTA 20-Li C3-IAN 351753. 6558999PRTA 20-Li C3- IAN 385583, PRTA 20-Li C3- IAN 402319, PRT 300 A1- IAN 360066, PRT 550 A1- IAN 311404, PRT 550 A3- IAN 330241, PRT 550 50 50 A- IAN 351652 High efficiency: The coil design reduces air resistance and cuts more efficiently, so you can reach the hard-to-reach edges of your garden lawn. The aerodynamic shape allows the wire to stretch and absorb shock on hard surfaces, providing less resistance for more efficient cuts. Time saving: the automatic replacement of the coil feed system simplifies the tedious work of manual winding of spools. Quick and easy replacement without tools. The 27 ft long trim line offers gardeners more space to trim. Package size: You will receive 4 replacement bobbins that fit perfectly into the thread holes. Portable 1.6 mm for fast cutting.