This cage has the same design as the Dave-O . I have a set of matte black carbon Dave-O cages on my Colnago Master X-Light. The plasticnylon version works exactly the same for a fraction of the cost. The nylon version weighs about the same as some stainless steel cages , however you don't have to bend them to accommodate your bottles. They hold the bottles nice and snug, but they withdraw easy when you need a drink. I've tried some of those carbon cages you can buy on ebay or Amazon and they don't hold the bottles securely and can be dangerous on rough roads if you lose a bottle. These cages come in different colors to match your bike (if that matters). These work well with the Polar or Camelbak bottles. You can't go wrong with these cages.