These are spurs.. for your sneakers!
You can use these to keep other pedestrians from passing you, accent your belt buckle, or train your dog!
Glue 2 of the spikey things together, you should have 2 in the end. I used 3mm filament melted on each end to hold them in place.
I used velcro to hold them onto my shoe. There are also slots where you can put tape or a strap of some kind.