The Shoulder Strap is adjustable and padded with a slight curve that molds nicely to most shoulders.
This Shoulder Strap works with every FLEX System Center Section because they all have the one-inch female quick release buckle. But note that in order for the Should Strap to work with the B0 SLIM configuration (this configuration has no Center Sections) you will need to have a pair of D3 Clips (which come with the Slim Handle Kit).
The Shoulder Strap has a 12" curved padded portion to make the strap more comfortable on your shoulder.
There are two male quick-release clips, one on either end of the strap. Each strap on either side of the pad is adjustable. The strap can be adjusted from 27" to 39" total length between the clips.