Lace-free laces: no more double knots and no more laces to tie. Turn your lace-up shoes into slip-on shoes so you don't have to worry about loose laces. Your shoes will never come loose, no more laces to tie. EASY TO USE: Just slip on the laces, tighten the screw lock, tie the knot and tighten the screw lock again. Tie them once and you won't have to tie the laces again. Remember to keep track of the length, once cut, the length is fixed. Inner material: rubber Sole: Rubber Laces are versatile: they can be used on boots, work shoes, tennis shoes, basketball sneakers, sports shoes, casual shoes or any other shoe. Perfectly designed for anyone, runners who want to speed up and athletes who want to improve their performance, as well as those who suffer from arthritis or other disabilities. Easy to install: one size fits all (children and adults), quick to install and easy to use. Easy fitting instructions and video provided. Packaging: 50 pairs of metal capsule locks for laces, gold colour.