UK-08 Multi-Color Woven Adjustable Ukulele Strap Fits All Ukes

This type of uke system is adjustable so it can be used with most uke sizes and is designed so that no strap buttons are needed.

Walker & Williams UK-08 Multi-Color Woven Adjustable Ukulele Strap

Ukes almost never come with strap buttons or any other good way to attach a strap. This around the neck strap style is the most popular way to deal with that problem. This is the same method that classical guitar players use and because they have a wide range of adjustment for length, the Walker & Williams UK series straps can also be used for many classical guitars.