As you might guess, "Organeco” comes from "Organic” and "Eco”, which are the two core values that underline Hape's quality standards and social awareness. This Organeco Blocks set has 25 extra-large bamboo blocks decorated in bright, interesting designs. Bamboo is eco-friendly, beautiful and extremely strong. The hollow design of these blocks makes them surprisingly light and easy to handle despite their fun, large size...and the bamboo makes them durable enough for heavy use. Boxed set of 25 blocks measures 26 x 13 x 3.25 inches. Largest rectangular block (blue) is 8.25 x 2.75 x 2.75 inches. Big cylinder blocks are 5.5" inches long. Age 18 months+