Wooden Baby Toys Montessori Hand Balance Learning Educational Preschool Training Baby Gifts It is a thick board with a helical groove on it. Children can put a small ball in the groove and control the ball to move it from the start to the end by hands balance. After children can control one ball in the groove successfully, then the children can put two or more balls in the groove and practice more. It toy can develop children' attention and balance ability. Material: Made of natural wood and Environmental Friendly Paint. So it's safe and durable. Good for creative thinking and improve both baby's IQ & E