Giant visually stunning building bricks made from beautiful rubberwood with colorful transparent acrylic inserts. Can be used in building and stacking with double and half sized bricks. The set includes 36 pieces (24 large, 12 small) with rounded corners and colorful inserts (red, green, blue, yellow, clear and mirror). Children will hold them up to their eyes to see a world in different colors. Can also be used for color mixing and on a light panel. Size of large brick: 7.87" x 3" x 3" . Size of small brick: 4" x 3" x 3" .