Features Contains 40 wooden blocks Blocks are a lovely dark blue colour Packaging consists of a sturdy wooden case, perfect to store your KAPLA wooden blocks in! Made of 100% untreated wood Coated with non-toxic dyes Each plank measures approx. 11.5cm x 2.5cm x 0.5cm See how your imagination and creativity can come alive by adding a splash of colour! This set is great for gifts and for enhancing your natural Kapla creations with distinctive Kapla colours. The unique wooden Kapla storage box is constructed without any nails, screws or fasteners and a sliding clear lid. Add some red to your wooden creations! Kapla's long and thin planks are based on the progressions of the uneven numbers 1:3:5. Three thicknesses for one width and five widths for one length. This ratio between bricks and stones and beams and planks now opens a whole new way of building. With these identical planks the builder can construct with the precision of artwork and the stability of stones. The use of identical unfixed pieces develops the child's aptitude for organizing elements in a 3-dimensional space and allows them to discover and sharpen their manual ability in relation to objects.