I bought a 6-String fretless in may of last year and if had the original strings on for the past 10 months, broke a string, and figured its time to change em,

I was wondering whats a good set of string for my 6 string fretless, something with a long lifetime and holds tones well especially on the low B, i play a variety of styles from slap to playin with picks, and i tend to play hard, i need strings that can take some abuse, any recomendations?