Refinements in every element of sound production give the U Series richer, more resonant sounds with more balanced timbres across the entire keyboard range. Special rib configurations reinforce the soundboard, while barring and other improvements improve rigidity, resonance, and structural stability. To achieve excellent sound generation and response, as well as long-lasting durability, U Series hammers are made from materials specifically selected for each model. A damping mechanism, previously used only in grand pianos, prevents the lid from abruptly falling onto the keyboard. Width: 121 cm; Height: 153 cm; Depth: 61 cm; Weight: 228 kg.