6Al4V titanium spikes. These are actually modified tent stakes. They've been sharpened, anodized, and a Kydex sheath molded to them.
Specs:
6Al4V titanium
5mm diameter (just over 3/16")
6.5" length (length will vary slightly due to being handmade)
(we did not manufacture the product, we bought it to modify)
One piece included per purchase