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. The SOFT SOUND SERIES pre-tuned Napa heads have a warm, softer attack followed by a deep sustain. Each drum is stackable inside the other for easy storage and transportation. Size: 10" head diameter/18" 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.