Projection-Plus Double-Row Tunable German Silver Tambourine 10 in. The Grover Pro Tunable Tambourine affords players who prefer a natural skin head the ability to maintain a consistent head tension regardless of the temperature and humidity. Grovers titanium tuning pins grant players a tuning range not previously possible with professional-level tambourines. The design produces limited extra weight and bulk because the tuning mechanism is completely internal. In addition to being tunable, the Grover Pro Tunable Tambourine is customizable: The 18 jingles of the top row are interchangeable, allowing for an unbelievable number of different combinations to customize your sound. Jingle Packs sold separately.