These are coolest blocks! Each set is made up of identical pine wood planks. Due to their unique size - in the ratio of 1:3:5 - KAPLA planks are an innovative building block, ideal for creating a wide variety of structures, from buildings and objects to animals and people. KAPLA is very simple and just requires imagination - no glue or screws - and each plank is simply placed on one another - balance and gravity alone keeps everything in place. This set contains 100 blocks.