The Green Toys Block Set is the world's most environmentally friendly basic building set -- and now it's better than ever! The 18 boldly colored, lightweight blocks have been re-engineered for easier grip and better stacking action. This unique block set includes a variety of shapes for building castles, towers, or any imaginative structure budding architects can dream up. Plenty of Good Green Fun. Color combinations may vary. Dimensions: Single Block: 2-3/4" L x 2-3/4" W x 2-1/4" H.