I accidentally bought the wrong size. I purchased these from Soundhouse, so they are genuine. I took out the 5th string once to try it on a bass, but I haven't wound it around the peg, so rest assured. ■ 5-string bass strings ■ Stainless steel round wound ■ Extra long ■ Medium gauge ■ .045, .065, .085, .105, .130 ※ Compatible with basses 36 inches or longer. Not compatible with basses 35 inches or shorter. ~From the manufacturer's website~ ■ Ken Smith offers nearly 150 different sets to cater to a wide range of music styles (like their basses, each string is handmade), making them one of the most trusted and beloved strings in America for over 20 years. ■ Ken Smith stainless steel strings successfully reduce the rough feel often associated with conventional stainless steel strings by mixing in a nickel alloy, achieving the good feel and tension of nickel strings, along with durability, and the brightness and sharpness of stainless steel strings. ■ Ken Smith was a pioneer in developing strings for multi-string basses and taper core strings, and was the first to commercialize them (Ken Smith was also the first to produce a 6-string bass). The high quality and ultimate balance of these strings reflect Ken Smith's own experience as a professional studio musician for many years, as well as the ideas of top musicians in New York. ■ Ken Smith manufactures its own strings and inspects each one by hand before packaging, allowing them to consistently provide high-quality strings to their customers. As a result, they are genuine strings that can meet the demanding requirements of professionals. Please try these high-quality, well-balanced strings made for professionals, which you won't find anywhere else.