Ultra strong zip ties with tensile strength up to 50 pounds, durable and long lasting Round ending special design VS to sharp ending, no hurt the skin when using. Reusable zip ties for money save & eco-friendly. The tie wraps is with zippers, no slip off although it is easy retracted design. Made of Nylon PA66, no smell & none toxic, makes it durable enough for indoor/outdoor use, not easy to break. ️️️Notes️️️ Please allow slight dimension difference due to different manual measurement. Due to the light and screen difference, the item's color may be slightly different from the pictures.