Size: Diameter 1.91 inches / 5cm before inflation , diameter 2 to 5 inches (5 to 12cm ) after inflation, 5 inches is the maximum inflation size , it is recommended to inflate the balloons up to 3 to 4 inches(7.6 to 10cm ) in diameter to avoid explode . Notes for Operation : These small bubble balloons are harder to inflate than bigger bobo balloons, It can only be inflate with manual balloon pump . Please read the third picture ”How to Inflate” carefully before buying . Package Include : 100pieces small clear BoBo balloons , 1 roll of 157 feet / 48m long fishing line (it is not for tying the balloons, it is for linking balloons as may need ) Material : These tiny balloons made of TPU, a kind of plastic , non-toxic , high transparent, not cloudy. Widely Application : These little clear bobo balloons are just like fake bubbles , can be use to decorate most parties , such as bubble party , summer swimming pool party, baby shower ,wedding , mermaid birthday party, mother / father’s day ... Important Tips for Operation : * Please stretch the balloons before inflating, so it can below up easier. * While inflating, it is very important to hold the balloon port as tight as possible to avoid leaking air. * Please don't use electric balloon pump or helium to inflate the balloons, manual balloon pump is recommended, please don’t blow the balloons with your mouth . * After inflation, please pull longer the tail , then tie a knot at the tail , and be sure to pull the knot tighter to avoid leaking air. Pack Include: You will get 100 pieces latex free round small bubble clear balloons, one roll of fishing line (48meters / 157 feet ), an User Manual (Please contact with us if any parts missing , we can send you a new pack for replacement or refund you )"