Size 100 before inflated, after inflated become shorter to +/- 80-90 cm. Price for flat foil balloon not inflated. Add 6000 for inflated balloon.
If you wish it to float please check on Helium Balloon section or
How to inflate DIY:
There is a small valve, inter the a straw in it and blow, after inflated full enough pull out the straw and press the valve, it will seal automatically.
On Changing temperature or after carry by motorbike sometimes they deflated a little. Inflate it again with straw.
Do not inflate too much, on out door area foil balloon will expend it self from the moisture weather.