Most important Prop - part one

Our main prop we are going to need is a bomb. After thinking and researching about how to go about this we decided the best way forward is to use a grenade prop which we will have tied around the back of our victims body and we will use either cable ties or rope so that it looks like he has been tied up professionally the grenade will sit in his hands that are tied up so that it is not obvious to the special forces men when they walk in to the room.