The Athletics Spikes Needle 9mm are longer needle replacement spikes suited to sprinters and middle-distance runners who need extra grip on the track. The 9mm needle profile provides deeper penetration for confident traction during explosive starts and high-speed running phases. They're particularly useful on older or softer synthetic track surfaces where shorter spikes may not provide sufficient grip. Always verify your event's spike regulations before competing to ensure needle spikes and the 9mm length are approved for your track.