Strap bumpers are a great way to protect your camera body from the metal on the strap. The Integral strap bumpers can only be ordered with the strap because they are assembled together, but you can add the others to your strap at any time.
O-ring strap bumpers are made of rubber and are thicker than the other bumpers. It's also recommended to use them if you are attaching your strap to a rod. This will keep the split ring securely in place. They are easily added after the strap has been assembled. $1 each.
Octagonal strap bumpers are a great leather option that can be added to your camera strap at any time. They are made from the same leather as the straps, but we make them thinner so they are more flexible and protect the camera body better. $4 each.