Arundel Mandible carbon water bottle cage. Purchased new from Bicicletta in July 2019 for $105. Only used on about a half dozen rides, as I found the grip on my bottles a bit tight (which is actually a selling point of this cage according to Bicicletta's product page: https://bicicletta.cc/collections/water-bottles-cages/products/arundel-mandible-cage).
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This is the matte black version, and weighs 25g.