Stimulate creativity and imagination with 40 colored smooth-sanded pine building planks. No need for glue and not a single nail, screw or snap. Kapla Stacks are not interlocking. Each Kapla plank is simply placed one on top of the other and thus held in place by gravity and balance alone. The flat shape and light weight wood enhances confidence and curiosity and determination. Part of the delight is removing one plank at a time until the whole lot comes crashing to the floor. An instruction booklet describing techniques and models is included in every box. Great for individual or group games and projects.