Bags of 100 ONLY (except 1″ javelin spikes come in bag of 20, and blanks come 50/bag). Pyramid and Needle spikes. Pyramid spikes are for Dirt tracks only, Needle spikes are for synthetic (rubber) or dirt tracks. All spikes are Steel. X-mas tree (compression spikes) are for rubber tracks only. See our helpful Spike Guide link up top for more information.