Made of PA6 (Nylon), put the blades in water the night before use them, they will last longer.
Durable Serrated Blades for heavy weeds and thick grass,Good for grasses and thin brush, not for saplings or other hard material. For best use, avoid using this accessory for edging, working alongside brick, chain, or wooden fencing
Pack of 20 nylon blades AC052N1FB compatible with Ryobi 2-in-1 Pivoting Fixed Line and Bladed Head Model # AC052N1.