Renner is the world’s most-renowned manufacturer of piano actions and hammers. Wherever there’s a grand piano in a large concert hall or an upright in a discerning music lover’s living room, Renner is usually involved. Renner’s promise and objective is to provide precise, meticulous handiwork to create an unmistakable tone - one that sounds the same all over the world. Even when pianos with Renner actions are transported long distances or exposed to fluctuating temperatures, the sound never changes thanks to our impeccable craftsmanship.