George is so ignorant. There are very, very few components that use "steel" leads.......are you kidding? Almost all transistors, tubes, resistors, capacitors, etc. use copper leads. There are a few rare op amps that use steel leads and some inexpensive diodes use steel leads. George lives in an alternative universe. All fuses sound different and all materials sound different. Only those that listen with an open mind and heart truly KNOW. Fuses and fuse holders do not have "steel" connections....most all of them are brass or bronze.