Spiroku will definitely give you a new building experience. Stack the cylinders of unusual shapes as you wish. Bright colors and unique contours will inspire long building and creative games. Try to stack them one on top of the other according to size and then pull the smallest one and get ready to be surprised! You have a long tower :) While playing, children will develop fine motor skills, creativity, and visual perception of space. Spiroku consists of as many as 9 cylinders of different sizes. The diameter of the largest cylinder is about 10 cm. Made of high-quality plastic (BPA-free).