Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Can also be used for self defense

I like to keep my road bike load-out very light, so when it comes time to outfitting with bike accessories and tools, every ounce has to translate to added capability. In the case of this tire and tube kit, the plastic wedges can also be used as kubatons/striking devices should you have to defend yourself on the bike trail. I keep them in my bike shirt pocket for that purpose.