Standard size 22 inch leashes that have a rubber tube end that plugs onto the end of your sunglass frames. They will attached to most frames but sometimes they are really snug. This leash fits most people but does not fit real big guys with a big neck. We are working with the manufacturer to make a leash that is much longer, it will be available sometime this summer. If you are bigger person with a wider neck, we just our other extra long tube end leash found here.