The V21 reed, affectionately known as the "Silver Box," is a reed that combines the cut of the V12, which is popular with many users, with the conical design featuring a narrow heel found in the Vandoren clarinet reed, the latest model, the "Légère 56." This combination provides a balanced, warm, and deep sound across the entire range, with a responsive, core sound that resonates far. The wide intervals and leaps that the V12 and Légère 56 excel at can also be performed with a uniform and rich tone, and these advantages are also inherited by the V21. The heel uses the Légère 56, and the tip thickness is the same as the V12, aiming for a pure sound that is easy to articulate and less prone to noise, while achieving the V12's softness and a refined, mellow tone that envelops the sound. The more vividly changing tone further expands the musician's musical expression.