String search - 4 same darker blue silk color on stagg sg or fusion

I bought an harshly used stagg fusion bass for 40 dollars ,installed with darker blue silks.
4 are same color. All the bass resonates and all notes are joy to press and clearly heard.

Can you help me to identify ?

I made a mistake and changed the strings with dunlop warms. Bad strings , strings buzzess at fingerboard and you must press your fingers strong to get a clear note. I did not like tones and extra thickness. Bass does not resonate and Bass turned in to electric guitar , tasteless.

 

Michael , You are right but I have throwed the strings to trash yesterday.