There's no rubber coating overtop the opti-grab. It's just bent metal painted black. i bought a set of bent metal (they're round not square like the opti-grab) and had installed it on my goth bird...but found not real use for them unless i had the bird sitting at nikki sixx height. I hang mine lower like krist novoselic.
Its just a bent piece of metal BUT does have a rubber coating over it.
