White and black discs (each side also has a different surface and can also be determined by feel).
Clip with sizing connectors for one-size-fits-all fit (Up to 8.5" wrist circumference)
Each time there is an alternating possession situation, flip the black and white disc by rotating it upon legal throw-in.
When the disc has the white side up, it represents the home team. When the black side is up, it represents the visiting team or team with the darker jerseys.