Material: Plastic, Length: 95 mm. Suitable for Ferrex aldi 20V / 40V cordless brush cutters, FAR 20-ia FAR 20na. 【About the blade material】 Made of PA6 (nylon), soak the blades in warm water the night before use for longer life. Ideal for grass and thin bushes, not for young trees or other hard materials. For optimal use, avoid using this accessory for trimming edges, working with bricks, chains, or wooden fences. Quantity: 50 plastic blades for Ferrex aldi brush cutters, perfect replacement for the original blades.