From the manufacturer

Weed Warrior products are built for toughness through years of detailed research & development both in the lab and in the field. Feedback from professional and commercial users of trimmer line and lawn care products are the lifeblood of Weed Warrior product development and is what helps bring some of the most durable and innovative products in the industry to market. Look no further, as Weed Warrior trimmer line, heads, and accessories will meet all of your outdoor lawn & garden maintenance needs.

Highly Durable

The Weed Warrior Push-N-Load replacement blades are incredibly durable and built to last. Impact modifiers are added to the nylon for increased durability and long life.

Easy to Use

Changing blades literally takes only seconds:

Push the button and slide old blade out
Insert a new blade and push past the metal post and pull back out until an audible "snap" is heard

The push-n-load nylon replacement blades for the push-n-load 3-blade trimmer head are designed to last longer than line. The serrated edges are sharp to cut through grass & light brush.