Package include: 20pcs x Foam Ball Material: High quality polystyrene Size: 10mm to 40mm (Pls choose the size you want) Feature: Funny,exquisite,practical,convenient Features High quality and new package Use for molecular model making and various craft activities Can be coloured with paint to create various animal and human characters Great for Christmas tree ornaments and decorations Design them any way you want to Make your own ornaments or design kits Absolutely great for youth or school group projects,family party. Notice: 1.Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. 2.The colors may have different as the difference display,pls understand.