These are the PRESTO strings that overseas rockabilly players are all talking about. They have a very soft tension and, because they have a steel core, they also work with magnetic pickups. I put them on once, but they weren't to my liking, so I'm putting them up for sale. - Brand: PRESTO - Product Name: Double Bass Strings - String Type: Nylon Tape Wound - Tuning: Orchestra Tuning - Size: 3/4 Size Thank you for looking.