Gigi Bloks are lightweight building blocks that can be used to create skyscrapers, forts, animals, castles or whatever creative construction projects kids can imagine! The easy-to-manipulate cardboard blocks interlock with a super-stable nesting mechanism for highly interactive play. Leave the blocks as natural cardboard, or paint and decorate the blocks to your heart's content. The unique double-wall design makes Gigi Bloks extra durable. Set includes 50 double blocks (about 8" long) and 10 cube blocks (about 4"). Simple folding assembly required.