Black Diamond Four String Bass 45-100 N400ML37 Cryogenic Nickelsteel Bass This is the roundwound string

This is the roundwound string that James How and John Entwistle perfected into what was to become the industry standard

-Smooth surface causes less "squeaking" and easier on fingers

RotoSound Black Nylon Bass Guitar Strings long scale 65-75-100-115 RS88LD

The taper by the ball end is 2″

Black Diamond Four String Bass 45-100 N400ML37 Cryogenic Nickelsteel Bass This is the roundwound string400 CRYOGENIC 320 BASS GUITAR Cryogenic treatment provides optimal performance for Black Diamond Strings bass strings by bathing them in liquid nitrogen to 320F. This treatment process relieves internal tensions and reshapes the high carbon steel core, leading to reduced elasticity and superior tuning stability so your bass strings can last longer!