Most BMX Bikes and Grips these days come with Bar ends. They sit in the end of your bars and protect the ends by acting as end plugs. Most Bar Ends are just push fit Plastic, however some manufacturers still make Alloy ones. Some even make something in between the two. You choose what suits you best, Alloy ones could last you a lifetime. Where as Plastic may be short term they are a lot lighter in weight.
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