Montessori Sound Shakers Good condition! Two are chipped bit nothing major. Please feel free to ask questions! Smoke-free and pet friendly home! From the website. The Sound Cylinders help to refine a childs auditory sense and improve concentration, coordination, independence, and problem solving skills. 2 sets of 6 sealed wooden cylinders that make a distinctive sound when shaken. The cylinders are graded from very soft to loud, and each cylinder has either a red or a blue top and is contained in a wooden box with a matching red or blue lid.