Firstly, @SexInTheCity is correct. They definitely cannot be used anally.
Secondly, there are anal beads that will work. They are much lighter and have more substantial removal rings. If you think the string is too long, you don’t have to insert all of them. Some options would be these classic style ones or these shorter ones
Alternatively, there are some beaded plugs such as this vibrating one or this set of two
If it is the moving balls that attracted you, there are some plugs that have that feature: