I made numbers and symbols for my BIG (85mmx85mmx25.5mm) friendship bracelet bead decorations.
You can run fishing line through the beads, but there is also a hole on the back that will fit one of THESE magnets, if you are putting them on something metal.
The size looks great with 2.36" ball pit balls, commonly found on Amazon, to make large friendship bracelets for desks, bedrooms, or dorm rooms.
Letter beads can be found HERE!