For dual-sided hook & loop closures (where both sides have hooks or both have loops, or one side has both for self-gripping), suppliers include Halco (specialty), WBC Industries, and various sellers on Amazon (like Canopus, Skywalker), plus medical/industrial suppliers like Allegro Medical, while Aplix offers hook-to-hook for packaging; you'll find options in rolls, straps, or custom cuts for diverse needs like cable management, medical devices, or packaging.