Very%20young%20builders%20will%20love%20these%20sturdy%2C%20cardboard%20building%20blocks%20because%20they%20are%20lightweight%20yet%20durable!%20This%2024-piece%20set%20features%20three%20sizes%20of%20%26quot%3Bbricks%26quot%3B%20for%20constructive%20imaginative%20play.%20Made%20of%20premium%2C%20extra-thick%20cardboard%20for%20strength%2C%20they%20are%20easy%20to%20assemble%20and%20feature%20a%20wipe-clean%20surface.%20The%20red%20blocks%20hold%20up%20to%20150%20lbs!Details24%20lightweight%20yet%20durable%20blocks%20in%20three%20sizes%20are%20perfect%20for%20little%20builders%20with%20big%20plansBright%20primary%20colors%20with%20brickwork%20patterningPremium%2C%20extra-thick%20cardboard%20is%20easy%20to%20assemble%20and%20easy%20to%20wipe%20cleanSuper%20strong%20-%20the%20red%20blocks%20hold%20up%20to%20150%20lbs!Adult%20assembly%20required.