CNET has a review of the Plantronics Discovery 655 and writes - “The 655 is a bit more slender than its predecessors. Instead of the same cylindrical shape of the previous models, it has a more tapered form factor. It’s also reasonably compact at only 0.6 by 0.5 by 2.0 inches and weighs a slight 0.3 ounces. Yet like its predecessors, the 655 fits directly in either ear with a rubberized ear gel. Overall the fit was comfortable and secure, and it even comes with two additional earbuds in different sizes. While there is an optional ear hook for increased stability, we preferred to go without it–the fit was tight and uncomfortable.”

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