This set of 510 highly appealing colourful octagonal discs come in two sizes, with notches for interlocking and a central hole suitable for threading. They can be used to construct abstract or symmetrical structures, are ideal for sorting and pattern-making, and will help children to develop fine motor skills as well as encourage logical and creative thinking. The discs come in six different colours and are supplied in a plastic container for convenient storage. Dimensions: 120 large discs (63mm dia.) and 390 small discs (38mm dia.). Pk size 510. Age: 12 Months+.