The bopworx double bumper has two faces and rotates in the middle allowing you to align each side at any angle each side of the bumper has a soft yet extremely durable rubber contact point which leaves no marks or scratches the straps are also made from a soft yet strong and flexible material which is great to manipulate round tight or oddly shaped areas of your bike the bumper attaches to your bike via a hook and latch system the double bumper is a great way to stop two bikes from damaging