Steel track pins (needle shape) that will fit in any pair of track spikes. Each pack contains 15 pins.
5mm pins are typically used for a lighter runner that cannot put as much force into the track, while 7mm are used by more powerful runners.
Most tracks will allow up to 7mm pins to be used on a synthetic surface. Many tracks will not allow needle pins to be used (please check with the facility you are planning on using these with). The Saskatoon Fieldhouse, and Edmonton Butterdome will not allow needle spikes on their tracks.