Stronger so they last longer.
RPS stands for Reinforced Plain Strings and these 2239 Super Slinky electric guitar strings are a reinforced version of the standard Ernie Ball strings.
A patented winding of bronze wire is tightly wrapped around the lock twist of the ball end. String slippage and breakage are minimized at the ball end where these most often occur. RPS strings last longer and stay in tune better than conventional plain strings. Used on electric and acoustic guitars but not classical guitars.
All Ernie Ball strings are precision manufactured to the highest standards and most exacting specs to assure consistency, optimum performance, and long life.
Ernie Ball is the pioneer of rock and roll guitar strings. Jimmy Page, Eric Clapton, Steve Vai, and Slash are among the long list of Slinky players.