It’s maybe not the biggest KPop merchandise you can get but probably the most original. This is B.A.P concert whistle you can use for supporting your favourite band by making a (loud) commotion on the streets or in front of the concert hall one of the KPop groups is going to perform.
It comes in a transparent package with a chain. If you want to you can consider it as a necklace. As a bonus you will get 3D wristband and a lomo card.
The price of $19.90 is not much for the fun you will get and a chance to support the boys from B.A.P.