- Corrosion-resistant brass mechanism: built to withstand frequent retuning while preserving a clear, stable tone for rehearsals and professional performances. - Copper string adjuster: specifically designed for use with copper-wound strings and compatible with Urheen fine tuners to provide precise pitch control. - Fast, secure installation: includes a dedicated installation tool that lets you attach the adjuster safely in seconds without special skills. - Balanced frame design: a compact, portable frame that combines strength and lightweight handling — suitable for travel, stage use, and regular practice. - Ideal for all skill levels: suitable for beginners learning to refine their instrument setup as well as experienced performers who need reliable, stage-ready hardware. - Durable performance: materials and construction focus on longevity and consistent tuning response under repeated use. Function and compatibility - Function: fine-tunes string pitch accurately and holds tuning under frequent adjustment. - Compatibility: designed for copper-wound strings and use with Urheen fine tuners; intended as a durable replacement or upgrade for musicians using these components. Typical use scenarios 1) Practice and lessons: quickly fit the adjuster between sessions to keep instrument tuning precise during daily practice. 2) Live performance and touring: corrosion-resistant brass resists humidity and repeated tuning on stage, offering dependable tone and tuning stability. 3) Workshop or setup session: use the included tool to install or replace fine tuners during instrument setup or maintenance with minimal downtime. What you get - A copper string adjuster with brass mechanism engineered for clear sound and long-term use - A quick-install tool for fast, reliable mounting This product is focused on dependable function, compatibility with Urheen fine tuners and copper-wound strings, and durable construction for both practice and professional use.