Why would you string up your quality PRS guitar with anything but quality PRS strings? This is a Light Top Heavy Bottom set of 10-52 electric guitar strings, which have been used on factory setups on PRS guitars for more than 30 years. A great set for players who want to down-tune while still keeping the higher strings light for easy bending. The strings are nickel-plated with hex-shaped high-carbon steel cores and kept in corrosion-free packaging!