Block Mates will turn your unit block set into a fantastic dinosaur set! The all-new block play sensation that will revolutionize and revitalize the way that kids play with unit blocks. Slide the Block Mates onto a traditional-sized unit block to create fun play friends! Pieces slide on easily and fit snugly thanks to the patented "Slip-Grip" system! Match the colors to assemble familiar animals, or mix-and-match the pieces to create your very own! *5 piece unit block set not included