VivaRhythm Soft Sound Series Drums deliver a lower overall tone with outstanding projection. The synthetic shell features a rubber bottom to prevent slippage or scratching and is shaped to allow air to escape from the shell. This creates low fundamental tone that resonates fully. Pre-tuned Napa heads produce a warm, softer attack followed by a deep sustain. Each drum is stackable inside the other for easy storage and transportation. Size: 14" head diameter/23 1/2" height. Materials: Synthetic shell, Napa head. Features: Synthetic shell is perfect for outdoor playing - Non-slip rubber bottom - Lower tones with great resonance - Stackable for easy storage and transportation - Pre-tuned Napa head creates softer, warmer sound.