Aquila strings of Italy introduced this new set, which is made with a proprietary plastic compound; a dense elastic-plastic blend. "The result is a string with density, stability, and the ability to resonate at very low frequencies,” Kala says.
Suitable for both the Kala U-Bass and the Ashbory bass. Some users prefer these strings, saying that their intonation and volume is improved over the stock strings; they also reportedly take less time to "stretch and settle" than the stock strings. They have somewhat of a higher tension and stiffer feel.