Blood Type Patches/ ACU Dark/ Hook Fastener (O NEG) Hook Fastener on the back. (*** Loop Panel included in package***) Size: 2 x 1 inches. High grade Strong Self Adhesive Hook Fastener & Thread. Clearly to read. Fully embroidered. Best For your MC, MA Gears, Uniform, Backpack, Tactical Vest, Cap, Hats. This items made to orders by LANSTANG SHOP & Ships in 1-2 business days With tracking number.