The Nike Zoom Matumbo 2 track spike features high strength Flywire technology that minimizes overlays and locks the shoe to your foot. Phylon™ midsole with carbon fiber midfoot shank provides cushion and support. Four-spike, Pebax® three-fingered plate offers increased traction. Includes ten 1/4" spikes and a wrench. Wt. 4.2 oz.