Material : Wood Dimension : 8" x 6" x 4.5 Set of 2 boxes with 12 pieces Used in montessori and pre-schools Fun and educational Durable and safe The sound cylinders are a very fun sensorial activity. The purpose is to refine the sense of hearing and to teach vocabulary such as “loud,” “soft,” “loudest,” “louder,” etc. Traditionally the activity consists of twelve wooden cylinders, six with red tops and six with green tops. Each set is filled with six different fillings that each makes a different sound, such that there are six matching pairs. Brand No Brand SKU 100280766_NP-1020545541