End Spiked Pitching Rubbers -  Youth Size - 4" x 18" Youth Size - 4"x 18" Metal spikes go through steel tabs at the end of rubbers for easy installation with a hammer Designed for installation on the pitcher's mound where the pitcher pushes off to increase throw velocity Four spikes are included for setting the rubber into place Rubber construction stands up to a season of hard-throwing hurlers Two holes on each end of the pitching rubber allow for accurate installation