6 replacement spikes for vinyl bases only. When your players are trying to hit for the cycle, these heavy-duty vinyl bases will hold up to every base runner. Hitters can slide into the bases without the fear of injury thanks to the soft, cushioned feel of the poly-foam inner core. Inclement conditions are no match for these bases, as the nylon-impregnated vinyl covers resist water and weather. Sure to stand up to rigorous play, the bases have Inverted sewn corner seams and a double-thick top that will hold up from the first pitch all the way to the last out.