Cotton Carrier original, flat, virtually indestructible, friction-free, hard-anodized aluminum hub. This hub is only required if you need a spare or have lost your origina Use the Cotton Carrier CCS Flat Camera Hub Single Kit as a spare or replacement part. The hub is constructed from friction-free, hard-anodized aluminum. This kit includes a hi-density rubber washer, stainless-steel mounting bolt, Allen key and a split ring for use with a sold-separately tether strap. l hub.