ALU-15L-B ALU-15L-B (Black), Fully machined aluminum belt loop, Aluminum shaved type, Anodized, Ultra lightweight 1.6 oz (47 g); Total length 3.8 x width 2.6 x depth 0.4 inches (97 x 65 x 10 mm) (pipe outer diameter), Aluminum count A6000 Series [Al/Mg] Silicone [Al/Mg] 0 Series Aluminum Stronger and more durable. ALU-15L-B (Black) because it is difficult to weld aluminum, the joints of the belt loop body and pipe are shaved out.