I've seen many posts enquiring about custom string sets, especially 4-string BEAD. Warwick Strings come in a variety of sizes and sets, with lots of options! They are very high-quality, and we offer something for everyone. You can learn more about them here: http://warwick.de/modules/produkte/product_list.php?rndtop&katID=14510&cl=EN We offer a choice of of electric and acoustic bass strings, in configurations not commonly seen elsewhere. Warwick Electric Bass Strings *Warwick Red Label strings - Stainless Steel and Nickel Roundwounds, available in 4, 5 and 6 string sets. *Warwick Yellow Label strings - Nickel plated, handwound roundwounds, made in US, available in 4, 5 and 6 string sets - also with the option of a 5 string set with either high C or low B. *Warwick Black Label strings - handwound, stainless steel roundwounds, made in US, available in long and medium scale. The long scale strings come in 4, 5, and 6 string sets - and feature the option of a 5 string set with either high C or low B. They also come in 4-string sets for BEAD or F#BEA - with a low F# at .175". The Medium-Scale sets are available in 4 and 5 string sets, which includes a piccolo gauge set .020" - .080" *Warwick EMP strings feature the Enhanced Molecular Protection coating, made in US, and are available in 4, 5 and 6 string sets - with the 5-string option of either high C or low B. They feel great, sound great, and last a very long time. Warwick Acoustic Bass Strings *Warwick Red Label Bronze acoustic strings - for medium-scale basses. *Warwick Black Label acoustic strings - phosphor/bronze - which come in both medium-scale and long-scale *Warwick Triumph Bass Strings - specially designed for our Electric-Upright Triumph Bass. They are handmade nickel plated flatwound strings, available in 4 and 5 string sets - with the 5 string sets having the option of either high C or low B. Please let me know if you have any questions, and if you haven't played Warwick Strings yet - give them a try!