Gauges 045-065-085-105-125 Working in conjunction with Rocco Prestia, world renowned bass player extraordinaire, Dean Markley developed NPS RoundCore Bass strings the old fashioned way… carefully wound on a round core. The extra time and effort put into NPS RoundCore Bass strings gives them a quality that you just don?t find in today?s conventional bass strings. By using a round core, NPS RoundCore Bass has more mass than ordinary hex-core strings. This provides total contact between the core wire and the outer wrap. The resulting total-contact gives you a fuller sounding, longer lasting string with a lot more tone, punch and brilliance. You?ll also love the feel of NPS RoundCore Bass.