Jam plugs for Roller Skates with a bolt on, 5/16 or 5/8 toe stop fitting. These jam plugs from Sure-Grip will stay securely in your plates, and protect them during your dance sessions! 
These rubber coated plugs are a little chunkier than the fo-mac ones, making them ideal for skaters looking to try plugs for the first time, or skaters who like to use the grip to performe toe plug spins or other moves, where a little grip is useful.  (Fo-mac plugs will not grip the floor at all)
These will not fit metric thread plates like Roll Line or STD