WORLD??S BEST STARTER CORD – our is unbreakable & guaranteed for life, and if our product breaks or fails you in any way, we will ship out a replacement cord you at no cost ( including free shipping ), period! – and that??s how we value our customers with the best customer service and hassle-free guarantee. Please make sure you check the correct diameter and length you need before purchasing ( installation tip: adding a few drops of superglue to the knot will prevent the knot from coming undone – see installation instructions ) 1500 lbs breaking strength, zero stretch, chemical, UV, corrosion, abrasion resistant and is 58 times more durable than nylon pull cords! Incredible durability – is proven to last for 1.4 million pulls until failure and was tested by the world??s leading high tenacity fibre experts, Tension Technology International Most importantly our lifetime guaranteed cord will eliminate the downtime, inconvenience, monetary loss & frustrations associated with broken cords, and will take any abuse you can throw at it!