There are a lot of digital spinners available. We used "Decide Now' app a lot when we were in-person. Now we are using WheelOfNames.com, but before we used iPads in lessons, we used these good old fashioned spinners made of cardstock.
These are the ones we used for Line and Space notes. We created a whole bunch of games with these spinners from "plying the key that matches the spinner" to "placing a penny on the line or space on the staff that matches the spinner."
Two sisters on two continents - working together, teaching together and creating super resources for group piano lessons! Yay! These are resources we used in our in-person group piano lessons. Now we have created online-versions of everything to keep our students loving their lessons.