A Minimal Machined Masterwork The Madison is the younger sibling of the Mehlville, which was our very first carabiner and continues to be a constant best-seller. Like the Mehville, the Madison features a machined two-compartment design to keep your eyes securely attached even when getting the Madison on or off a belt loop. The Madison is machined from billet 6063- T5 aluminum, which gives it a high strength to weight ratio. The thinner design of the Madison means that it always hangs straight; there's no side-to-side rocking happening here. With less bulk, the Madison is lightweight, functional and beautiful. Where form and function meet, you'll find The Madison.