With reliable support, durable cushioning, and great flexibility, thhis track spike is ideal for middle distances and intermediate jumps and hurdles. Streamlined upper features a resin-print exoskeleton design for unwavering support. EVA heel wedge adds lightweight cushioning. 6 spike Pebax plate gives you great flexibility and durability. Includes 1/4" pyramid spikes and a wrench. Spike size is 1/4".