1Material package set is made of co-friendly and safe material, non-toxic and harmless 2Helps to develop manual dexterity, imagination and learn the basics of physics. 3Develop children's hands-on ability and scientific curiosity, stimulate interest, independent thinking 4Handmade material kit,which needs assembling by hands, let the children experience the fun of science in play. 5Boost the relationships between parents and children by playing together Bubble has a kind of godless attraction, a small bubble, crystal clear, colorful, like a time machine to evoke many people's memories of childhood. Handmade material package, hands assembled, let the children experience the fun of science in play. Features: Material package set is made of co-friendly and safe material, non-toxic and harmless Helps to develop manual dexterity, imagination and learn the basics of physics. Develop children's hands-on ability and scientific curiosity, stimulate interest, independent thinking Handmade material kit,which needs assembling by hands, let the children experience the fun of science in play. Boost the relationships between parents and children by playing together Specification: Material: plastic Type:#1, #2(Optional) Age: over 14 year Power supply: AA*3 (not included) Product size:15.5 * 11.5 * 16cm / 6.1 * 4.5 * 6.3in Weight: 180 -185 g / 6.3- 6.5 oz(approx.) Package list: 1 set x DIY Bubble Machinekit(battery not included)