This is a replacement puck for a Bubble Hockey table.
I recommend printing at 100% infill with PLA.
The puck must be heavy enough to pass through the table's scoring mechanism without getting stuck.
PLA has a lower Rockwell hardness than the acrylic dome, while ABS is higher. ABS could scratch the dome during play, damaging an expensive and hard to find part. You may also want to sand the PLA smooth, for faster gameplay and to decrease wear on the play surface.
There are a few types of bubble hockey pucks, and this one may not be compatible with your table.
Example of a bubble hockey table: