Santoro Interactive 3-D Popnrock Greeting Card, Bird Cages (SPR026) Innovative and carefully created miniature work of art in a dynamic 3D interactive card 7-inch wide x 6.25-inch tall Fully assembled, opens to form incredible 3 dimensional shape that rocks back and forth while objects in the center sway in harmony Can be personalized with a message and sent as a greeting card, no additional postage required Unique ground breaking design also makes them a perfect paper collectable