From the perspective of safety and reliability, the top five slings in the world are: 1 German Delage Group (a participant in European and American sling standards), 2 American Certex Group (U.S. Standard participating units), 3 Japanese Kito Group (Japanese standards and American standards participating units), 4 Dutch Green Pin Group (European standards participating units), 5 American Ankara Group (American standards participating units). These enterprise groups have a history of hundreds of years. They are all participants in European or American sling standards. They all have many invention patents and have product liability insurance worth hundreds of millions of dollars. Hope this helps.