The BUNJEEZ ® Elastic Lacing System is easy to use - just lace, lock and rock. You will never tie your shoes again! These are preowned excellent condition in black. The laces are 26 inches which fits most all shoe sizes, but we think it would be better for children, teens, women. These were used on a women's size 8 and doubt they would be comfortable for anything much larger. These were purchased years ago when the owner of company had them on QVC. No longer have instructions but they are rather easy to install...take out old lace and place shoes on feet lace with the bunjeez lace when at top feed ends of each lace thru the circular disc and pull each to side to snap them in place any excess lace can be looped to back clip... Then you slip shoes on off and never have to tie laces...that's the whole idea.