Includes 10 disks, .118"(3.0mm) Gauge, 18'(5.5m) length Replacement disks simply pop into place, you can replace trimmer line in as little as 20 seconds! The compact size makes them easy to carry with you, saving valuable time when working big jobs Used with Oregons 24-500 5" Professional Gator Speed Load replacement trimmer head Tongue & Groove line profile creates sharp edges for cleaner and faster cutting Up to 2X longer life. Breakthrough formulation combined with a patented heat treatment process provides increased durability and strength, less wear and reduced breakage This is a replacement part Part Number 24-518-10 This is an O.E.M. part