The holders are well made and the pigtails are 16 AWG. I also checked two fuses and they behave as they should. I've seen comments and videos criticizing these types of fuses made in China by people who don't understand how these fuses work. They think that a 1 amp fuse should blow at any current over 1 amp. It's not like this. For readers who are not clear on how fast acting glass cartridge fuses such as 3AG and 5x20mm behave, here is how they must operate to meet the specification: 1.) The fuse must be able to withstand the rated current indefinitely. 2.) It must carry 110% of the rated current for at least 60 minutes. 3.) At 200% rated current it should burn out within ten seconds. A video I saw demonstrated the above behavior well, but the narrator complained bitterly that the fuses were junk. and insecure. Please note that fuses for DC and low-frequency AC, e.g. B. 60 Hz are designed. If you plan on melting your speakers, consider testing them on a dyno. Even at audio frequencies, the skin effect greatly changes the behavior of fuses. Also, fuses with round elements behave differently at audio frequencies and above compared to flat elements. There is no requirement for this. You should do your own dyno testing to find the fuse type that will do what you want.