Derby Laces Blue Spark Shoelace for Shoes, Skates, Boots, Roller Derby, Hockey and Ice Skates PERFORMANCE METALLIC LACE: Sold as One Pair (Two Laces). Laces are flat and about 3/8 inch (9 mm) wide with hardened plastic tips. Multiple lengths available (pick your length). SPARK by Derby Laces create a natural friction when tightened to help them stay tied, tight, and where you want them. SUITABLE FOR: Children and Adults. Regular Shoes, Skates, Boots, Hockey and Roller Derby. VARIETY: SPARK by Derby Laces are available in a large variety of attractive colors and designs. We are constantly expanding our selection of colors and sizes. Click on "Derby Laces" under the header to see all the options or visit derbylaces.com HARDENED PLASTIC TIPS: SPARK by Derby Laces feature a hardened plastic tip that is extremely durable. DURABLE FIBERS: SPARK by Derby Laces are braided laces made out of metallic coated durable fibers. They have a unique texture that allows them to tighten and loosen easily.