FSA Energy Stem Gray Logo, 120mm IMM25_M0415

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In fact, you'll find it's actually lighter than many of its carbon counterparts, coming in at only 111-grams for the 90-millimeter version. Now that we've established the Energy Stem as light, you're probably wondering how it manages to stay exceptionally stiff and strong. In that case, note the 2014 aluminum alloy construction, which is one of the strongest lightweight alloys available, as backed by extensive use in the aerospace industry.