This accessory box contains 12 classic magnetic Magformers rectangles which contain free-spinning neodymium magnets safely sealed in every edge. The pieces are twice 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 christmas or birthday present - extra magformers pieces are always welcome. Helps children to scale up whatever theyre making. Compatible with all other magformers sets. Magformers pieces use strong neodymium magnets and tough abs plastic. Educational, fun, super strong and endlessly creative. Size H13.6, W8.3, D6.8cm. For ages 3 years and over. WARNING(S): Not suitable for children under 3 years old. Only for domestic use.