Also a great training tool for children educates and improves your child's interest. -Mini "> thumb piano keys are made of metal rods of different lengths to improve sound resonance. Mini "> Easy to use, just play with two fingers to make a sound, you can make the music you earn creative. -Mini "> Small size and lightness for easy transport and storage. "A-list-item"> high quality coconut material with local wooden veins is robust and durable enough for long-term use.