In drum making, a certain wood species is often chosen for its specific make-up, and related tonal characteristics. Combining these veneers can offer a wider range of sonic possibilities and customization. California Custom Shop Hybrid Shells are crafted to do just this—combined with patented manufacturing techniques, proprietary adhesives and years of know-how.

Spruce has been a preferred tone wood for acoustic guitar tops for generations. The resonant qualities of this cherished wood species had not been employed in drum making until experimentation began at the Cali Custom Shop. Mixing the soft material with favored drum tone woods such as maple, cherry and mahogany was found to deliver a round, punchy sound that has since toured arenas and graced the world's most celebrated tracking rooms.