They are for looks mostly. They bolt into the bar end with an allen bolt. If they are vibrating around, you might want to snug them up. Bar end weights have been used to quell vibration but aren't as effective as rubber mounting the bars (like Harley) at the triple tree. I replaced mine with Throttlemeisters (Kuryakin also sells the bar ends). If you take them off it won't hurt anything (except the looks) and you might get a little more vibration in the bar. Take them off as an experiment and see.