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AH!! now we have edited the question!!
Cylinders are not normally coated with Kevlar unless they are made from the lightweight material CARBON FIBRE.
This Kevlar gives the carbon fibre some extra protection and a little more resistance to knocks and bangs.
The carbon/kevlar cylinders (they're not common) are much much lighter than a steel or Alloy cylinder so it saves weight for the diver on their back.
One drawback is that they are inherently buoyant.
Therefore they require an adjustment on weighting, and are not normally used in Technical diving as Stage Cylinders as they Bob up and get in the way.
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