In fantastic condition with two of the small cylinders missing. This Cylinder Socket Toy Puzzle help children develop fine motor skills, improve observation and problem solving abilities. at the same time, it can also help children understand and master the concepts of size, shape and space 【Material】Montessori knobbed cylinder block is made of wood material, durability for long term use.Every Wooden Cylinder Block contain different wooden cylinders with different diameters, and heights, and corresponding slots. Children need to place each cylinder into the correct slot through observation and experimentation to complete the challenge. Montessori Knobbed Cylinders can be used as a teaching tool for schools, home schools or early childhood development.