Mathematics Rainbow Donut Logarithmic Plate Fancy Cognitive Wooden Toys It's the classical mathematical tool and cognition teaching aids for children's early education, play the role of the enlightenment to the child. This is one logarithm of child's brain exercise game board, consists of ten pillars on the board, 20 pieces of wood and 55 grain combination of building blocks. This product's color is gorgeous, the teaching is clear, it can attract children's attention, and be able to let the children feel the joy of learning. It is made of the high quality wood ,through elaborately grinding and polishing, feeling is exquisite without barb, will not hurt the baby's skin with qualitative feeling, strong and durable. Parent can teach your baby ,not only can be parent-child interaction, and also can increase the feelings with baby.