FishHawk Metallics are the finest metallic threads in the world. We start with a nylon core for maximum strength and windability. Then we apply rice paper for ultimate flexibility and bonding. The metalizing is silver alloy (not aluminum) so it won’t tarnish or lose its luster and shine. Finally it’s finished with a polyester film which keeps it smooth, supple and fray resistant. FishHawk metallics are available in size A in the following spool sizes: 100 yds and 1oz.