I just handcrafted the best middle distance racing spikes. I took an old pair of el cheapo bowling shoes, traced the spike pattern of a pair of Zoom Milers on the sole, screwed some screws through, attached some tiny washers and nuts and sharpened the tips of the screws. The weigh in at 2.9 oz. I did a couple 400m intervals at my local track and they are by far the best spike I've ever run in. I may get some odd looks but who cares when I'm dusting everyone.