Monel flatwound (E and A) and nylon (D and G) double bass strings for full-size and 3/4 size upright basses. A great set for jazz and rockabilly styles of playing – super flexible and easy to play in all positions. The E and A are Monel flatwound on a nylon core producing a strong, deep bass tone. The D and G strings are nylon on a nylon core for a smooth tone with easy bendability.