The Virtually Unbreakable Buckle: The Cobra buckles (patented) are, without equal, the world's safest, most finely crafted, and strongest load bearing quick release fasteners available. They are also the only safety buckle on the market that will not open while under load. That makes them the best choice (we believe, the only choice) for ensuring the highest degree of safety for your customer. All parts are CNC machined, stamped, polished, assembled, QA inspected, and packed (re: from alpha to omega) in a ISO 9001 approved facility, located in the famous Stubai valley of Austria. All Cobra products are tested and certified by highly respected independent /3rd party test houses to meet the highest degree of reliability and assurances for static and dynamic strengths. All Cobras are made from the highest grade 7075 aluminum alloy and solid brass internal release mechanisms. Each production batch is randomly test certified for strength and in the case of our NFPA buckles all are individually test loaded to 11kN and rated for 18kN. What this means to you is that Your dog will not break this buckle. Period!