With this postcard from Idena, you can send very special greetings, because inside the greeting card there is a construction kit. On the inside of the folding card there is a large text field for labelling with your message and on the back the address can be entered. The mini building blocks postcard is sent as a letter. The building set includes 42 stones and illustrated instructions (English language not guaranteed). The assembled heart is approx. 4.8 x 4.8 x 4 cm. The clamping blocks are available in many different colours and 11 different sizes and shapes, with the smallest stone measuring 4 x 4 x 5 mm and the largest 35 x 8 x 5 mm. The finished models look particularly detailed and almost like the original. The mini building blocks are made of high-quality ABS plastic.