Tends slack well, releases smoothly, and about 13-14 oz. Midline attachable. It has been suggested that I edit this first post to show the current state of the Bones, so here goes. The standard compact Bulldog Bone comes with three interchangeable bollards on the top arm that can be interchanged with tools and a new SS cotter pin. Here is an excellent video that John has made of this standard Bone. I also make a compact adjustable Bone which uses a SS 10-32 machine screw to move the bollard in the top arm of the Bone to adjust the gap where the rope is installed. This bollard is held from rotating, so it wears faster than the standard Bone bollard, but replacement bollards and spines can be obtained from me if desired (the spine being the part that connects the top arm to the bottom arm) I should mention that a Rock Exotica nano swivel can be installed directly on either Bone, replacing the teardrop attach point at the bottom arm. I also make a lanyard adjuster called the BOLA, which is shown here in another video made by John!