Material : Wood Dimension : 9.5" x 5.5" x 5.5" Set of 4 Knob less cylinders boxes Used in montessori and pre-schools Fun and educational Durable and safe This set of knob less cylinders descending in diameter, descending in height and a block. Playing with this game enhances visual discrimination, observation, concentration, eye hand coordination and provides first hand experience of size grading. Brand No Brand SKU 100281904_NP-1020551328