Create dynamic, elaborate tube systems and use the pump to make water flow through! This early STEM set supports problem-solving, fine motor skills, descriptive language, role play and critical thinking. A set includes a pump, 72 open-ended attachments with 12 types of tubing and 12 suction cups. Size of pump: 10cm L x 6cm W x 36cm H (4" L x 2-1/2" W x 14-1/4" H). Size of smallest tube: 7cm L x 4cm Diam. (2-3/4" L x 1-3/4" Diam.).