Science & Exploration Sets features: This kids knock toy is made of high class material, which is durable for lasting use. It can help kids exercise their arm muscles by knocking on the balls. It comes with the colorful balls design, which provides convenience to lead kids to identify the color. This multi-functional knock toy can offer kids comprehensive early education. Features-Color: Green-Material: Wood-Size:29.00X21.50X9.50cm/11.40X8.45X3.73inch-Lovely kids beating game has a great explosion of power: it needs a quick knock on the knocking table to cultivate baby's response and concentration.-Parents give encouragement and praise to stimulate the baby's interest in playing and cultivate self-confidence.-Let the baby know the color of the balls and blocks, and improve imagination by playing.-After polishing and punching, the edges and corners are smooth and without burs.-Dense texture, hard, impact resistance, strong load-bearing, suitable for the baby's small hand to grasp so that the baby can't put it down while playing.