High elastic foam arch, soft and not deformed, with strong toughness that can be pulled freely, don't worry about hitting the baby when used correctly.baby play mat can train your baby's limbs such as kicking, stepping, lifting, rolling and hand grabbing from an early age, helping to train the coordination ability of the limbs of your baby.The angle of the piano is adjustable to provide a variety of ways to play. Your baby can tap or pedal on the keys. The pleasant sound is enough to attract the baby's attention, let him play freely and free your hands.