Tougher on weeds. Easier on the environment. For over 50 years, Shakespeare has designed and created the best products for essential yard care. Nylon is known for taking hundreds of years to break down (trimmer line is made of nylon). Now, Shakespeare is slashing that time dramatically to 30x faster than conventional trimmer line. The Impact line is 20% more durable than professional grade trimmer line and has 15% more runtime than non-twist in cordless string trimmers.