Cup StructionStack, create and play with this fun building system! Forty eight cups feature specially designed ridges that interlock for sturdy stacking. Follow the included build ideas to design volcanos or other fun objects, or let your imagination run wild with your own unique creations! When the fun is done, run the cups through the dishwasher for easy cleaning and then stack them for compact storage until the next play session. CupStruction is a fun building