The poplar DiscDot from USA is a putting tool that helps you increase your accuracy. The DiscDot is easily attached to the chains of a disc golf basket giving you an exact target to aim for in your practice.
DiscDots comes in multiple colors and some of them ar UV reactive. By that, the glow when exposed to UV light. These are not to be confused with the Glow plastic, that will keep glowing for a while after being exposed to light.