We operate a small nursery and use thousands of these rubber bands every year to secure our bulbs and plants in their paper or plastic bag wraps. The quality is excellent with no more than a few defective bands in each bag and this particular size of band stretches well 2-3 times its diameter without breaking. Like most rubber products they don't hold up well after prolonged exposure to sunlight or higher heat environments and can get brittle after months of being in the sun. For normal household use however they can last a few years without breaking. The BEST advantage is the price since very few retailers offer this quantity at such a low price.