85% Polyester / 15%Reflective WireEach shoelace features a bright silver reflective material which will shine in the dark, Used for replacement of shoelace, hoodie drawstring, pant drawstring,great for those who enjoy running or doing exercise at night because of high visibility offer safety for night exercise.Good Replacement Shoelaces Mix of woven polyester material and braided stretch polyester, width 0.19"(0.5 cm), durable and thicker than original shoelaces. 12 different colors,10 different lengths satisfied your need in every situation.Package 1 pair pack (2 laces). Design for all ages - elderly, kids, adults, women and men. Great for all sneakers - high top sneakers, sport tennis, basketball baseball, volleyball shoes, boots and more.Measure the Size Measure how long the laces you'd like to replace before purchase to get the best fit Measure your original shoe laces tip to tip and then read the size charts in the product photos for reference.Note- Do not use excessive force tied laces, It is easy to damage the laces. If you have any concern about the product or services, please feel free to contact us by email.