In a piano, a double hammer rest rail  is a specialized mechanism designed to improve the instrument's repetition speed and dynamic control, bridging the gap between standard upright and grand piano performance.  It is often found in high-quality upright pianos.

A multi-ply hard wood pinblock is the "anchor" of the piano. Its job is to hold the tuning pins with enough friction to resist nearly 40,000 pounds of string tension while still allowing a technician to make microscopic adjustments.

Vertically Laminated Maple Bridges on a piano are important for musicians in a high-performance piano, becasue they are engineered to solve the "energy leak" problem found in traditional solid wood bridges. While a solid bridge is good, a vertically laminated one is often considered the gold standard for tonal projection and structural longevity.