Product details:

Gigi Blocks are lightweight building blocks that can be used to create skyscrapers, forts, animals, castles or whatever creative construction projects kids can imagine! The 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 Blocks extra durable. Set includes 80 Double Blocks (about 8long) and 20 Cube Blocks (about 4"). Simple folding assembly required. Ages 3 and up.