These HP spinners are a simple way to keep track of your Adventurer's HP without searching for HP values on a D20, D6, or the possibility of the D20 being knocked or moved and losing their HP value.
 
Pinch the top and bottom center like a fidget spinner, and just use another finger to rotate the nubs on the dial, and the dial will rotate and snap into place on each number.
 
Note - These 3d printed spinners WILL melt or deform if left in extreme heat like a car during hot days. Warped or Deformed spinners from heat will not be replaced.