This balloon with a congratulations cake motif is suitable for any occasion.

The balloon can be filled with helium and floats for 3 - 7 days.

The balloon can be refilled again and again using the self-sealing valve.

Attaching a weight prevents the balloon from flying away unintentionally.

Expert tip: If the balloon starts to lose helium and is no longer inflated, an adult can refill it with a little air via the valve using a straw. In this way, it can float for many weeks until it eventually runs out of helium. This saves helium. 

Caution!  Never inhale or deliberately inhale helium due to the risk of suffocation. Do not allow the balloon to fly as it is electrically conductive and could cause damage to high-voltage power lines.