Cascade Lead Came 3/16in Round U 6ft (Rolled & Bagged) - Stained Glass Supplies By Stallings Stained Glass Flat Bottom Round Sided U Cascade Lead Came Channel .154 (5/32"). Face .185 (3/16").	Width .249 (1/4").	Radius .140" (9/64"). Cascade Lead Came is made from a very closely controlled alloy that combines a fine grain structure with high strength. Started with 100 percent pure lead exacting quantities of Tin, Antimony, Copper and Bismuth are added. The came is with over 99 percent pure lead but can now be stretched to the breaking point still maintaining a fine grain structure. This alloy also prevents oxidation, making for easier soldering and allowing a long shelf life without tarnishing.