These are very strong and well made split rings, good in fresh or salt water. The standard of American industry, these split rings are used by manufacturers throughout the world. They have proven their outstanding capabilities by their continued use in aerospace programs and defense equipment. Naturally, these are quality products of the U.S.A. Size #2 (20# test), size #3 (25# test), size #4 (30# test), size #5 (40# test), size #5-1/2H (100# test) and size #6 (80# test).