Stack, roll, stick and sip! Each of these vibrant, squishy silicone cups features a suction cup bottom plus a suctioning rim at the top. Stack them up tall. Stick them together and then pull them apart to hear them POP! Stick them to the walls of the bathtub or the windows of the playroom. Flip them on their sides and send them rolling or just use them to drink your juice. BPA-free and 100% food and dishwasher safe!