These are my current favorite bar plugs. They even replaced the Velox plugs on my Pass Hunter. They are made of polished and anodized aluminum alloy and have a resin expanding wedge thing, so they lock securely into the bar. I like the low profile look and smooth dome shape, clean, simple, and durable.
They are easily removed so they can be replaced after you re-wrap the bars, or moved to you new bike. At $9 a pair the price is right, especially so since they'll probably last forever.
We currently have them in silver, black, and brown. If they sell well we'll probably add some primary colors. We can have them made in any color, but the minimum production run is pretty high. Any ideas for new colors? The model we stock now is for 23.8mm (road-diameter) bars, but we might get some for 22.2mm bars in the future. Never thought I could write this much about bar plugs.