Rothco PVC Security Patch w/ Hook Back. The patches feature a hook backing which makes it ideal for attaching to our Special Ops Jackets Transport Packs Tactical Vest and more. WARNING: This product contains a chemical known to the State of California to cause cancer birth defects and other reproductive harm.' Specifications for Rothco PVC Security Patch w/ Hook Back: Manufacturer: Rothco Color: Black/White Gender: Unisex Height: 1.875 in Length: 3.375 in Design/Pattern: Security Features of Rothco PVC Security Patch w/ Hook Back Material: PVC Material Specs: PVC Package Contents: Rothco PVC Security Patch w/ Hook Back Rothco PVC Security Patch w/ Hook Back 27785