Audio Cables, We make all these cables to order. 30 plus years in the audio trade hands-on. All leads are made with 4 percent silver solder, for a better-soldered joint, that is harder than standard lead-free solders. Silver is also the best conductor and makes for better sound quality. Klotz and Van Damme cables have 100 percent pure copper content, they are touring grade, which means they will last for years.