Run fast and run alone in the awesomely light Brooks PR LD 4.48 track spike that's designed for the For 1,500 to 10,000 meters. Asymmetrical fit design, super thin air mesh, ultra thin and conforming welded construction. Pebax® Rnew six-spike plate, full-length EVA midsole, ultra-thin sharkskin outsole. Includes 6mm spikes and wrench. Wt. 3.6 oz.