The Buck'd 4mm Leash has an adjustable push button bead that allows you to adjust the leash to multiple sizes. This is perfect for Trans/FTM people who haven't had bottom surgery and have a smaller penis size making this the perfect design for Trans/FTM people or anyone for that matter. The leash also fits men of all shapes and sizes, so it's not a product that is only targeting Trans/FTM men, this leash can be worn by one and all.