The holders are usually designed to fit onto the aluminum ribs of your boat. It may have adjustable clamps or brackets to hold the top frame of the canopy securely.
The design involves molding or shaping the fiber and carbon composites to the required dimensions.
This can be done through processes such as vacuum assisted resin transfer molding (VARTM).
The process involves laying the fibers into a mold and drawing the resin under vacuum to soak the fibers and create the final shape.