LUXE BY MARTIN® Kovar™ SP Core Strings are where innovation and performance meet, for the player who knows exactly what they want from their acoustic guitar strings. Crafted with our high-tensile Superior Performance SP® core wrapped in Kovar, a nickel-cobalt alloy, these strings are all about delivering crystal-clear clarity and a tone so balanced it'll make your heart sing. These strings aren't just for show. They're made for the player who demands precision and power in equal measure. That's why we've engineered them with lower tension, not as a compromise, but as a conscious choice to enhance your technical prowess. So go ahead, dig in deep - these strings can take it. And durability? Kovar strings feature natural corrosion resistance, meaning these strings will be with you for the long haul, sounding as sweet as the day you strung them up. Ready to take your playing to the next level? When it comes to the art of crafting acoustic guitar strings, we don't just meet standards - we set them.