This accessory box contains 12 classic magnetic Magformers super squares which contain free-spinning neodymium magnets safely sealed in every edge. The pieces are four times the size of a standard square and help make mammoth structures, or add height to anything youre making. They are compatible with every Magformers set in existence. Makes a perfect stocking filler or birthday present. The perfect present for any magformers fan. These extra pieces can be combined with any set. Compatible with all magformers sets. Supersized squares make bigger structures. Magformers pieces use strong neodymium magnets and tough abs plastic. Educational, fun, super strong and endlessly creative. Size H13.6, W13.6, D8.3cm. For ages 3 years and over. WARNING(S): Not suitable for children under 3 years old. Only for domestic use.