Material:PA6 Nylon.Length:Original 10 cm long 【ABOUT SPARE BLADES】Made of PA6 (Nylon), put the blades in warm water the night before use them, they will last longer. Replacement blades Compatible with 70289A Weed Warrior Push-N-Load nylon blades Pack of 30 nylon blades compatible with 14867B Weed Warrior Push-N-Load 3-Blade Trimmer Head, PivoTrim Hybrid and Ugly Head Hybrid 2-N-1 weed trimmer heads 【Universal Fit】Compatible with following weed eaters: compatible with Echo gt225 gas powered weed eater, compatible with Ryobi gas weed eater, compatible with Ryobi 40v Expand it, compatible with DeWalt battery weed eater. They will also compatible with all gas and cordless trimmer which the pins are 5/16" diameter.