As you unfortunately have to take out a small loan for a wooden ball track we came to the Lena-ball track. It is convenient, though made of plastic, but the gameplay is huge ... building is sometimes a bit difficult (as described already here desöfteren), for the parts fit but good and thus firmly together. The structure will be adopted for our 4 year old son with us, because just plugging together not quite work out. We bought for this train yet an extension and can construct many different versions since. A really nice toy that entertains our child long. In addition, for plastic really stable. It is quickly broken down / up and you can easily transport it to Grandma and Grandpa :-)