The push-n-load 4-line replacement trimmer head by Shakespeare is a durable fixed line trimmer head with push-n-load technology that eliminates the need for winding spools. The head is made from carefully crafted glass-filled nylon for superior durability and abrasion resistance, it can withstand the extreme demand of any job. With its push-N-load technology, lines can be loaded and reloaded in seconds. With strips that are already cut to size, all you have to do is load them into the trimmer head. That means cutting more with less downtime to get the job done faster, leaving you more time to do the things you want.