These were the last pair of spikes I purchased and they assisted me run a few of the fastest times of my career. The frame determines to 8\u00a01/8" x 10\u00a01/8" in size. It turned out size 10 and in addition black/white in color. It can accommodate an iPod, or a business or the board card without losing its result. For most recreational runners, a pair of spikes is rather unnecessary.